I have an 89 S10 Blazer. Just put a new double roller timing chain and gear set on it. The truck is built. Bored 60 over, 350 Flat top pistons, comp cam, MSD ignition, etc.

Two days ago, it started acting like it was losing power. Idles fine, but when warmed up, I get to going down the road and give it gas and it bogs down. EGR valve & TPS were replaced 2 years ago. I know EGR is good because of how it idles. I believe the pintle on the throttle body is less than a year old. Pretty sure I have no vacuum leaks. Played with the timing some. Have been running it advanced for 3 years now, but dropped it back down to factory to see if that would help... No dice. What are some of the other possibilities for my problem here? Any help would be great as I will be needing to use it hopefully to start a new job. Thanks in advance.

Note: This is a TBI. NON VORTEC

 

Thanks for all the help! Turned out to be the fuel pump. Love the help anymore on this site...