I can not seem to figure out my issue on this miss. its got new plugs, newer cap and rotor (GM) plugs are good, has newer fuel pump. i first resolved it by blocking off the egr and it ran smooth so i replaced. miss came back. vacuum is holding steady at 19lbs so i don't think i have a cylinder problems. any ideas? i need to sell this car. I actually have two of them. both had the same issue. egr fixed the other so far.

1997 jimmy 4x4 auto.

 

forgot to add that i have the updated injection unit as well

 

no one has any ideas?

 

I had an issue similar to this after changing to the upgrade FI. lousy mileage was an added bonus. I finally had a Tech check it and all it needed was an O2 sensor. Afetr that Power was great and mileage went up to 20 from 14-16