WEIRD idle surge...kind of

[ramsack]

my car idles fine, but when coming to a stop, ONLY if the car is moving, even a slight bit, it will idle surge (slower than usual surge) until the car is completely stopped, and then return to normal idle. when i say slower than usual, it bounces between idle and ~1500 slower than if you unplug the IAC. there aren't any boost leaks that i'm aware of (been tested) or vacuum leaks. TPS is good and adjusted correctly. didn't test the idle switch yet. the IAC is also in spec last time i checked, and when i unplug it the car does it fast up/down surge. this is really getting annoying and it just started. oh and my FIAV is completely ripped out and blocked off. i JB-welded a piece of pipe in there. the idle misses a bit sometimes if i'm sitting in a drive-through waiting for food. new plugs, new wires. what else is there to check?

 

[ramsack]

that's good to know. last time i did seafoam there was some smoke coming from the exhaust manifold. i can't tell by hearing if there is a leak cause my exhaust is cut off a little bit after the firewall, so it's loud. maybe it's gotten to be a worse leak since. i definitely plan on getting new studs and a copper exhaust manifold gasket.