Ok so I just put a good motor in my car becuase my coolant seals went out in the old one.Before they ever did I had replaced that motor also.With the last 2 motors
I have the same damn problem.After 3400 rpm or so,the car falls on its face,hesitates,stumbles--you get the picture.(but only under full throttle half throttle its fine)I have backfires on decelaration also.
Now,I have changed the fuel injectors also on this motor.So what can be causing this.Motor has great compression.Someone said the injectors are not coming on becuase thats the point where they should--or around about.How would you diagnose that--or fix it.Second someone said the grounds could be bad--Ok
So as far as I know there all hooked up and good.Hell I only know of a few on the car.Starter,firewall to back of motor,the ground on the ratnest to the motor,and a ground,on the passenger side,near radiator.What else can I do Or check.ITS 86 GXL.
If it needs more grounding or better grounding--where should I do it.


>edit: signature removed for size violation

 

I hate to join the search ***** but you really should have searched, they've talked about this a LOT! Basically you need to go through the whole car and check every last ground, especially ones on the manifold.

 

the grounds on the manifold?--umm ok

 

Yes, on the N/A UIM there's a stud, with a looped wire around it, with a ring nut on top of it. on the rear right hand side of it (look at it from the drivers side)