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Surging help

2193 Views 12 Replies 6 Participants Last post by  mthomp1
Surging help -UPDATED with fix!

New truck. Ran good up till a few days ago. It surged a few times, felt like the APPS was failing. Replaced with a Timbo. This morning it did it the worst.

Right off the bat, cold engine, driving down the road, it drops down like you let off the throttle, then comes back. Feels like 1 second increments or so. Did it for 10 miles. Cruse on or off. Floored it still does it. Apps was constant. I got pissed and pulled over, no codes on CTS. Shut engine off, went into gas station, came back, did it for 5 more miles. Got repissed, pulled off road, key on/off codes pulled nothing. Then it ran fine the rest of the way to work.

Think it might be the ignition key, or is it a VP?
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Sometimes a failing vp doesn't set any codes unfortunately :-/
Can you see codes in the pcm and ecm? Or pcm only
Vps are usually inconsistent on issues like that
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I have ran nothing but edge comp w/ hot unlock on all my trucks with no issues.
I have a 2001 with comp and hot unlock and a 2001 that I p pumped. Both run great bit I did p pump my other 2001 for reliability
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