When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
When I first got my car it had a check engine light and it would get terrible mpgs, I read the code and it was bad eprom so I bought a new ecu and that fixed the issue, but since I used the new ecu when I accelerate the throttle fluctuates a little, maybe 100 rpm fluctuation. And sometimes at the redlight with my foot on the brake the rpm’s can sometimes drop below 500 and the car almost shuts off. The acceleration fluctuation happens maybe 80 percent of the time not always. Could this be a fauled 02 sensor since the car was running insanely rich for a while with the old ecu? This cable has always been disconnected since I bought it and it ran fine with the old rich running ecu Same with this one. I believe both photos with the unplugged cable is nothing because car ran good before.
81 vette weird acceleration
