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Jan 22, 2013 - Uploaded by Gary Castle, Jr
Surge while driving. ... 2006 Chevy Impala LS 3.5L Surge Under Load ... How To Fix Or Prevent Stalling, Surging Or Rough Idle, Cleaning ...
it could be as easy as replacing plugs and wires..but first check every single small diameter vacuum line you have as these get old the crack and get brittle i had a rough idle once and found a cracked vacuum line leading to my MAP sensor. i just cut off the worn end and just shoved it back on and it fixed it. Also its not very likely, but you do mention something about fuel gauge... so if you"ve never replace your fuel filter i'd spend the tim if to replace that as well. if its the new style with plastic clips, you just take a pair of pliers and squeeze and pull to release..but release pressure on gas cap before trying to replace the filter. can i get a very helpful thanks.
I would look into the catalytic converter too. I just went through this same symptoms. The engine will sputter and run rough. Drive a few miles at night and see if the front exhaust pipe, right behind the radiator, is glowing. That keyed me in. There is a special service to fix certain models for 01 and 02 which is sort of a recall but not exactly. The dealer just fixed it for free. The chevy customer service number is 1-800-630-2438, they can check and see if you Vin number is on the recall. Your local dealer may not know about it so call the number first and make sure you have the Vin, at least the last 8 of it, when you call.
P2176=Throttle Actuator Control System - Idle Position Not Learned Did you use all you old sensors,or is some of them from the new engine,I would swap out the IAC sensor or check for wires not hooked up. If it can't relearn to idle the Idle air control might be different then your old one,but its not registering with the computer
This sounds like a possible bad fuel pressure regulator. Depending on which engine (3.4l or 3.8l) they can be easy or hard to replace. For pics on the 3.4l regulator replacement, see this link... Tech JK ----------------------------