I have a stumbling tbi with a new tps and rebuilt dissy. it stumbles sometimes at idle to about 2000 rpm. i put it in Neutral and tap the gas and it straightens up and runs. it has a low pitch rod knock too. i dont think it is the ecm retarding the timing because it works fine in park or Neutral. thanks for all the help from you guys and gals on here. yall rock

 

TTT, sounds like my problem :P

 

stinger that is the exact sound my car is doing ttt and it last up to 3100 rpm. the stumbling is fixed though it was the dist. it was rusted inside.