still having idle problem, PLEASE HELP
Hi guys, thanks a ton for all the info in this thread...but after I checked the TPS voltage (.98v w/key on, same w/engine running) *and* disconnected the black and white EFI connectors, crimped female side a bit and re-greased, I am still having this idle issue.
I already searched the forums for a long time, couldn't find anything else helpful so please excuse me if the answer is on here somewhere because I must have missed it. So anyways, here we go:
Problem is only when car is rolling. Basically it wants to idle at 1600rpm anytime I'm moving, on start-up idle is at 12-1300, then drops to 800-900 as it should, no problems there. But once I'm rolling, I can push in the clutch and the engine goes to 1600rpm no matter how fast engine was turning before, and can have it in/out of gear and it still wants to idle too fast. The weirdest part is I can have it out of gear, clutch out, just coasting, idle at 1600rpm, then come to a stop for a stop sign/light/etc, and juuuust as I'm coming to a stop the idle drops back to where it's supposed to be, 8-900. What the heck?
It really really sucks trying to drive/cruise around slow, any ideas people? Any and all help would be great. I just bought this car back as it was my very first Mustang *and* one of the nicest ones I've seen, and I REALLY REALLY REALLY need to fix this idle prob! Thanks for any and all help...
91 LX 5.0, originally auto, converted to 5-speed, done so well one can't tell it didn't come stock that way. I'm assuming it's still the orig computer. TFS TW heads, E303 cam, cats have been hollowed out (so I was told), and no air pump. Underdrive pulleys. Intake is all stock except for 1/2" spacer under stock intake. That's all the mods that I think could have possibly anything to do with this issue.
UPDATE: I just got done cleaning my IAB, it was filthy, took about 30 minutes and a dozen cotton swab thingies. Went for drive, thought it helped at first but nope, still doing same thing. I can be cruising at 30 MPH in 4th gear, about 1200 rpms, I'll clutch/put shifter in neutral and rpms will jump to 1600. Then come to stop at light, and rpms will drop to 1100-1200 for a couple seconds, then eventually fall to 900 or so where it should be. ARGH!!! Please advise ASAP, this is driving me insane!!!