I think I may have killed my 307.  The other day I took my car down to the mech. (snow, ice, sub-zero temps and no garage is not a fun combo) to replace the TPS sensor which did need to be replaced. but when i tried to drive it home it ran like crap, so i brought it back.  when we opened the hood took off the air cleaner and started it, it was blowing smoke out of the pcv and breather valve.  We both though it was  blown rings. but there was no smoke coming out the tailpipes and the car has true dual 2" exhaust with no cats.  so he checked the plugs, and comp. and both turned out fine. and he said it was running rough but way too good to have bad rings.  So he told me to bring it home and take off the intake and look for any blockages or any thing out of ordinary.
The 307 has a larger than stock cam, 50-75psi of oil pressure, with 20-50 syn. oil, the original intake, 150k miles on it. was running VERY strong until a week ago.
I know i know throw it out and get a 350.  Would love to but budget will not allow it, and time is a huge factor.
Just hoping someone has run into this or something similar and might have a few pointers

Thanks  

Check the valve guide seals, particularly on the exhaust side. Maybe even a blown intake gasket where the exhaust cross over is. They are long shots but all I can think of if the plugs aren't showing anything.  Running rough is either un-related or possibly a symptom of the intake gasket leaking exhaust into both the lifter valley and intake runners (which would act as a major vacuum leak as well).  

I think you might be right. I did notice an exaggerated loss of vacuum in the brakes when it was starting to stall.  I have the intake off now and i have some sludge in the motor and the EGR was packed solid. Now i just have to fight the 30* temps and the snow and rain to put the car back together.

Thanks  

Here's another long shot, but still a possibility.  What was the engine temp when this happened?  If the new tps sensor is off,an extreme lean condition would cause the engine to run rough and would also cause the temp to up.  If it leans out badly enough, the heat could start to cook off some of the oil causing the smoke to come out of the breather.  It basically overheats the engine through the higher combustion temps caused by the lean condition.  

They engine couldn't of been that hot, I don't think, i only drove it for probably less than 1/2 a mile with the temps around 32*. But I will defiantly check out the TPS sensor.
Thanks  

sub 0F... did you have enough antifreeze in the motor?????  

Yup there was enough antifreeze in her.  I was talking to an old timer and he was saying that with a motor with 150k miles on it that is still running at 50-75psi oil pressure, is just just spraying oil everywhere because of the clearance between the crank and the connecting rods.  

I highly doubt it's spraying oil everywhere, it's almost a direct relationship to good clearances. Besides it's not knocking.  Did you get the intake manifold pulled? and if so see anything worth mentioning?  

It could be the engine just cooking off condensation causing the smoke you see.Run it,get it hot(operating temp) and see if it diminishes or goes away alltogether.As for the driveability problem.I agree,it could be that the Tps is not adjusted/installed properly causing a problem,could also be a bad coolant temp sensor causing the car to run rich.Vacuum leak/bad map sensor.Change the oil while you are at it.I have seen GMs'run lousey and then run great after the oil is changed due to lots of moisture/fuel in the oil.Cold climate and short run times will cause this.Good luck,hope this helps you.  

I saw some sludge when i pulled the intake, but nothing major. I do think its the tps thats the running prob. I just recently, int the past few months, changed the temp sensopr cause it was reading 100* too low. and i replace All the vac  hoses yearly cause i know these cars are very sensitive to vac leaks. I also just changed the oil after the intake went back on but because i put in 20-50 conventional instead of synthetic i was only able to start the motor while the oil was at room temp.  once the oil cooled down to the 10-20* temps out side the motor can barley roll over even thou i have 2 910/800cca red tops hooked up.  

Silly question but were there any drivability issues before repair ? If not TPS sensor may be incorrect,not adjusted properly or defective. If it drive fine before repair then that is where I would start.  

The car wasn't running right before the repair it started surging and wanting to stall. i had a comp. hooked up to it when i was driving and all the info pointed at the TPS.  But regardless the #5 cylinder is dead. only about 20psi. and the new mechanic says its moister coming out of the breather.
I can have the motor rebuilt, there was a lifetime labor warranty on it, i have yet to confirm if i can use it. or dishout the $3800 for a new 350 from GM Performance.