[Gstang]

I thought this looked like the right place to ask a question... When I start up my car it'll fire up just fine. But give it like a min. and my rpm's will drop down and about die, then they'll shoot up to the regular idle. Sometimes it'll drop nd rise and do that a few times and then stay at the base idle again. Please help!

[fox bodies rule]

Gstang, have you tried the procedure yet? With out any info about mods you might have it makes it tough to trouble shoot or offer suggestions. Also if your '88 isn't a California car it is speed density instead of MAF which definitely changes the picture as I know zip about speed density cars and their idle problems. If you provide more info I am sure that someone can jump in and help out.

[crazy horse]

check your local ford dealership for the Throttle Air Bypass Plate (TABP air adjust spacer plate). i got mine for $14.99+tax.

[fox bodies rule]

I can only guess that your dealer wanted to clear out old inventory, I was quoted 34.99! You gotta love the dealer parts guys

[88-gt-t-top]

Key On Engine Running: RPM shoots to 2000 back off throttle stop screw, idle lowers to 900 but consistantly jumps to 1,4-1,600RPM. Timing mark keeps jumping around so setting timing is out of the question. So if I tested the TPS correctly with the results that I have, whats my next step?
Key On Engine Off: Black->Black, Red->Green on the harness side of the plug. My voltage reading was .007, Does this mean there's something wrong with the plug? The wiring harness? WTF lol where do I go from here? Thanks for any advise.

[ub2uc4]

nice....I was think that too

[95cobra50]

I've been having idling problems like someone else here. it seems when my engine is "cold" it doesn't idle well, and when i press in clutch (to slow down or turn) it drops to 200-400 RPMS, and sometimes dies. i'll try this and see if this fixes it, that'd probly save me quite a bit of money.

GREAT post.