Its been about 7 months since i changed the plugs on our burb. ITs a stock 350 no idea whats in it bought it with the motor. Pulled the rear 2 passenger side plugs and they had crud that would definatly stop the truck from firing. What might be the cause. Some of my friends side it could be a ring allowing blowby (which it does burn some oil) Or an intake manifold leak.

Any suggestions would be great.

For the poll, I chose the second "what".

I'd do a compression test first. Come back with your results.

I disagree, it is definatly the first what. tongue.gif

Could be valve seals/guides/seat or rings.
If it was fuel, they would all be the same.

Dave, studies show that 57% of the public chose the second 'what'. graemlins/clonk.gif

I wondered why i kept asking me questions didn't know that i put a poll in their. Will a compression test and see what they are.