91 Chevy surging problems

Boedy · 01-04-2004, 07:05 PM

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 · 01-06-2004, 03:39 PM

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

Boedy · 01-13-2004, 09:34 PM

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

nusch · 01-13-2004, 10:57 PM

Have you checked the fuel pressure at that rpm range?

thud · 02-16-2004, 10:29 AM

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

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