Boedy

Just got a 91 Chevy 1 ton dually 4x4 with a 454 and automatic tranny. The truck runs great but I do have one little bug I am hoping you guys can help me out with. It’s kind of a weird problem that only happens at around 2300- 2500 RPM. I guess I would describe it as a momentary surge or jump in rpm’s that comes and goes but only at that rpm range. I thought it might have been the tranny but I am not sure why it would only slip at that spot and not anytime else. Any thought on this? The truck has a KN filter and Jacobs’s electronics but other then that it is stock. 109 k on it FYI. Thanks in advance for any help

toivo

check throttle position sensor, it may have glitche at that point.

Boedy

Changed the TPS and the problem is still there. Dont know what else could cause it to only surge at that rpm range.

nusch

Have you checked the fuel pressure at that rpm range?

thud

Maybe you have a vacuum leak, check the intake manfold gasket