Not quite sure how to describe my problem. When the engine warms up sometimes it skips, but it worse than a skip, it bucks sorta like driving to slow for the gear you are in. While this is happening the temp guage flutters and sometimes doesn't even register. Also it throws no codes. Here is a list of parts I've either tested or replaced.
Battery
Alternator
TPS sensor
MAP sensor
EGR valve
Distributor cap and rotor about 30k miles ago.
The gas tank, fuel filter and pump were replaced about 2 summers ago.
Any ideas would be greatly appreciated.

 

Anyone else ever have a similar problem? Any help would be appreciated.

 

It appears I solved the mystery. My problem was the ECS. Replaced and all is back to normal.

 

Glad to help ya

 

Sorry no one was able to get back to you here Watts, but thanks for posting up the solution to your problem. Hopefully your findings will be able to help someone else down the road.