95 sho mtx rolling idle on decel...

[forddealertech]

On decel-push in clutch & idle rolls 1100-1800 rpms,up & down-up & down.
Release clutch & smooths out to about 1500 rpms. Push clutch in & continues until car stopped,at which point steadys at 1500 rpms. Does the same on up- shifts. Zip tube sealed. Swapped out IAC- still no change. This started happening after I cleaned throttle body(!). WTH??? No obvious vacuum leaks... What am I missing??









95 MTX--77,000 miles
94 ATX--228,000 miles-DAILY DRIVER

 

[SHObill]

TPS? or throttle plate not sealing proper if IAB(C) did not help.

 

[93rev2sev]

The up and down idle change sounds like unmetered air messing with the IABs ability to regulate the idle (vacuum leak). Was the intake removed? When reinstalling, it's wise to loosen the hose clamps on the snakes so that they can settle onto the heads.

 

[Devin]

Could be the MAF. Make sure your grounds are all still clean too.

 

[forddealertech]

Checked the grounds-repaired G103 at left inner fender-poor repair previously-possibly when clutch replaced. All intake clamps tight-zip tube tight.It idles around 1900 now.
I'll clean the MAF & reinspect the IAC gasket--this just started after I cleaned the throttle body. I'm going to disconnect the clutch position switch to see if it changes the rolling idle. I'll keep you posted...