no partial throttle and idle surge 99 civic
 

so i have a 99 civic with a stock ls block stock gsr head ebay turbo 440 cc injestors ecu socketed tuned on unknown program. car came this way everything running fine then i blew my motor had custom car care put a new block and head in the car exact same setup no changes whatsoever to parts list. now when the car is at idle has a very fast surge, and i have no partial throttle. if im not accelerating im decelerating. when i try to hold the car at a steady speed in any gear it just jumps and studders. please help very annoying issue thanks.

Re: no partial throttle and idle surge 99 civic
 

Why haven't you brought it back there if they did the block and head install? Doesn't sound like anything serious, probably just a bad sensor or bad wiring from the original swap. Or a block and head that isn't compatible with whatever unkown tune you have.

Re: no partial throttle and idle surge 99 civic
 

i have tried taking it back they say i need a wire harness. i have since replaced that with out any difference being made. the block and head are the same as what i had before. i would love for someone to take a look at it and and pinpoint it rather than custom car care guessing which part i should replace till it resolves the issue.