looking for help

[gnray76]

car ran great... now I have no throttle above 75%
Its like someone shut the vehicle off, or something grabbed the back of car, no knock, tested fuel, never dropped or fluttered when this happened,
Idle is good runs smooth, just on accelleration to 3/4 throttle then the waste lets off and car nose dives???? let off and back in it, it pulls for a second and then drops again,
going to go out and see if I can record when this happens with BIG STUFF 3
Yes I have tried several files an none make a change... what else can I look for????
thanks, ray

 

[berserker6]

I had a similar trouble once. What I found was the battery cable coming off the back of the alternator during heavy acceleration was coming in contact with the drivers side header. And shutting down for a split second. And then come right back to normal. Until I tried to jump on it again. And I wasn't getting any codes. HTH