Have a 94 gmc box truck 7.4L. Runs great in park but wants to die in drive. Changed plugs and wires, now i have a code for IAC would that cause it to die in gear?


Asked by Oct 20, 2014 at 05:46 PM

Question type: Maintenance & Repair

5 Answers


Yes after that pull the big tube off the throttle body and clean the throttle plate in there it will be all black and carboned up. When done disconnect battery for 10 minutes this will clear code and reset idle to factory presets. Good luck


i sprayed a whole can of carb clean in it. going to pull cables and see what happens. sounds like it is starving for fuel or air. possible distributor?


oh and it wants to jump as soon as i put it in gear?


i got the truck and there is only 1 vacuum on a 2 sided vacuum port. not sure if that has to due with it.


unhooking the battery didnt help :(

Your Answer

Add photo

Related Questions

  • I need help with a 1993 gmc 5.7L tbi. 24 answers

    Ok, so i have a 93 gmc suburban. I just put a new engine in. It has flat top pistons running about 9.2 to 1 compression and an rv cam. The truck itself has about 282000 miles on it. I am having an...

    1993 GMC Suburban K1500 4WD


    Maintenance & Repair

  • started stalling and dying when in gear 90 answers

    350 motor 4L60E trans Motor wants to stall while in gear (but doesn't do it out of gear once over 1000 rpm it dosent) seem to stall and it is only from a dead stop. Fuel filter has been replaced an...

    1994 GMC Sierra 1500 C1500 SLE Extended Cab SB


    Maintenance & Repair

  • Stalling out and wont stay running. Acts like it wants to run but gets choked out. 50 answers

    I have a similiar problem as devin, my 95 Sierra 4x4 it has a 350 5.7L engine and the fuel filter has been replaced I cleaned the injectors out and put a new gasket on. The shop said I have good fuel ...

    1995 GMC Sierra 1500


    Maintenance & Repair

  • rough idle, stalling, loss of power. 228 answers

    o2 sensor code 44 (lean) Replaced: coolant temp sensor, tps, map sensor, fuel filter, and o2 sensor. It will run normal on occasion but only lasts about 45 seconds or so. I don't think its the torqu...

    1995 GMC Sierra 1500 K1500 SL 4WD Extended Cab Stepside SB


    Maintenance & Repair

  • why would my truck be rough idle and wants to die in gear 1 answer

    It started after I changed the donut flange gasket off the manilfold

    1997 GMC Sierra 1500 C1500 SLE Extended Cab SB


    Maintenance & Repair


Looking for a Used GMC in your area?

CarGurus has 213,457 nationwide GMC listings starting at $800.


Search GMC Questions

GMC Experts

#1 dragonflyoffshore
Reputation 4,930
#2 John Saffrahn
John Saffrahn
Reputation 4,310
#3 Richard Schroer
Richard Schroer
Reputation 4,080
View All