Engine dies reversing out of driveway

[cashflow50]

03 GMC Yukon 4.8L 2wd SLE

 

Pulled in garage after dropping my daughter off at her volleyball practice. Took a 2 hour nap while waiting. After my beauty rest jumped in my ride and started her up. Started like a champ. Started pulling out on reverse and all of a sudden engine just died. Started her back up with no problem. What i noticed was the change in idle. On reverse needle on guage went below 500 rpm...maybe at 400 or so. It slowly went back to 700 moments later. I then placed her in drive and same thing drop below 400 or so then gradually rises up. What the heck is going on? Dirty MAF sensor? dirty throttle body? plugs going bad? Please help. Thank you.

 

 

 

 

 

 

 

[Justin101714]

I'd remove the connector on the throttle body if its fly by wire and open the blade up and clean it. I don't know if you'd have the capability of doing an idle learn.....but you'd probably need that done as well.

 

 

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[cashflow50]

Its fly by wire. I'll buy MAF and carb cleaners. Hopefully after cleaning them up will work. I already have my plugs and wires to install as well. Crossing my fingers.

[cashflow50]

Removed the maf and intake tube. Cleaned maf with cleaner. Might as well clean the throttle body while the tube was off. Noticed a little gunk around the butterfly. Sprayed the area until gunk was gone. After drying them off for about 30 min, started her off and idle was back to normal at 700. Shifting from park to reverse and to drive was back to normal. Didn't drop below 500 anymore. Drove like a champ. I prayed it wasn't my TCC solenoid. I didn't want to drop the tranny bottom pan, because i would've had to change the filter, gasket, and fluid. Just me..trying to save money.