02 mustang idling fast wont shift into Drive (3rd gear)

[mysting]

02 GT Mustang U7146 after I removed the 93 octane tune back to stock the engine idles real fast 2200rpm in P and N around 1000RPM in D,it also wont shift into the final gear is this from the tuner or may I have another issue.

[mikel]

Any trouble codes?

[mysting]

P0602,P0605,P1211,P1690 Says these are normal then there was P 1690 and P1000-OBD that last one said see P1211 thanks for any help

[mikel]

Restore the stock tune and see if it acts the same way, does not sound like a tune issue.

[ak805x]

Restore the stock tune and see if it acts the same way, does not sound like a tune issue.

He's saying this issue is happening now after he went back to stock... Had 93 octane tune -> went to stock -> now experiencing problems.

[mysting]

thank you ak805x...... I didnt think it was a tune issue just thought i asked,,,,,,I've tried going back to stock original backup...the tuner says the rpm is at at 720 in N but its running around 2000 RPM'S even when I lowered the rpms thru the tuner it didnt change anything it still ran fast,,,,IF ANYDODY HAS ANY SUGGESTIONS I'M ALL EARS THANKS

[ak805x]

I dont know much... but I was having the same problem with my 05 mustang GT with the RPM being wild..

I made sure all the clamps were tight and everything sealed. I used MAF Sensor cleaner spray to clean the MAF sensor, and then I took off the Throttle Body and used a spray cleaner for that as well. Took off a lot of gunk buildup and made it spotless.

1. Put my car back to Stock Tune.
2. Did NOT turn car on.
3. Applied a Tune from the Diablosport Predator (91 Octane C&L Racer - because I have a C&L Racer intake.)
4. Once it was finished tuning, I unplugged the negative part of the battery.
5. After 10 minutes I plugged it back, and TURNED THE CAR ON.
6. Let car idle for 10 minutes.
7. Turned the AC on for another 10 minutes (full blast)
8. Turned off AC, and continued in idle for another 5 minutes.
9. Drove the car around town for 10 minutes, shifting below 3k RPM, nice driving.

Then I turned off the car and turned it back on after letting it set for 5 minutes...

The rough idling went away. Only thing is that it does go up and down when it's cold out.

[mysting]

ok thanks ,,,a guy i work with said it sounds like the maf sensor so i'll look into that

[mikel]

Check the IAC motor as well.