What is the part of the motor that gets the most stress?

PS it is not electronic.

 

i guess its the rings and he has low compression.

 

My guess is crank bearings or tone rine for the crank sensor
I have the same problem on my 95 but it doesn't throw any codes and its
Very intermintent

 

Well replaced the exhaust manifold gaskets, Flange dounuts and Muffler tail pipe to get rid of my exhaust leaks, With no luck problem still exist !!! Gonna try to get a hold of PaulGGoo. My guess to your question would be motor mounts??

 

do you think it's a bad piston??

 

Im thinkin we have a similar problem..Maybe it's the color of our trucks Lmao!

 

Could be I'm trying to get in touch with the guy with the answers!!!

 

Some suggested that maybe I have bad valve springs what do you think?

 

Yours could be a weak spring and i'm still thinking mine is a weak lifter..But wouldn't our symptoms show a leak down? I had mine tested several times and i have no leak down.
what a mystery.

 

A weak spring could be caught by a leak down test, but probably would not. A weak spring can still provide enough seat pressure to seal, but not enough to keep the valve from floating (being thrown by the rocker arm) which can cause a misfire.

A bad lifter will not be caught by a leak down.