1994 GMC C2500

Engine Performance problem
1994 GMC C2500 V8 Four Wheel Drive Automatic

old gas smell vacume leak onlly sometimes othertime3s hits on all 8 runs good suspect electric driven vacuum leak don't have analizer any guesses? This is a 454ignition is good new plugs wires module etc
Denny hemmingsen
September 28, 2010.

Hi there,

Thank you for the donation,

Can you hear a vacuum leak? If so a small amount of starter fluid sprayed around any suspect leak will pick up the revs, you do not have to drown it, less is better for this test, see if you can identify the leak, let me know how you get on.

Mark (mhpautos)

Sep 29, 2010.