Steven Petersen
I'm Awesome
Still fighting this thing. I got rid of the idle surge, it was the heat stove flapper in the air cleaner being stuck open. But I’m still getting 4 or 5 stumbles when it’s on fast idle 1200-1250rpm. After that everything is perfect. This morning I disconnected the evap canister from the TB and plugged the vacuum port. Still stumbles. All ignition parts are new Delco. New fuel filter. No changes in scanner readings when it stumbles. I have a new TPS arriving today, and new EGR valve and MAP sensor coming next week. Anything else to try?