hey guys, im havin some problems with my 93 FD. just recently ive begun to have serious issues with hesitation and stumbling as soon as i get on the boost. it doesnt matter what gear its in and as soon as i start gettin boost... i can pull it off to about 7 psi (approx 3500-4000 rpm) and then the car starts stumbling like crazy and i can even feel a lack of power with the 7 psi. im suspecting bad sparkplugs so ill get new ones and see what happens. does anyone else have any ideas of what else it could be? any advice is greatly appreciated

 

Have you changed your vacuum lines? If not, that could definitly be it. Also check ALL grounds. A loose ground can play havoc on our cars.
Change plugs, can't hurt, I run NGK 9's all the way around.If you haven't yet done it, change your wires also. Good luck!
BTW, how many miles?

 

trying taking off you neg cable on your battery and then pressing the brake down for 20 sec and put cable back on and try resluts.

 

ok guys thanks alot. im going to try all of those. im gettin the plugs today and ill see if that helps. maybe i should give a little background about the car. it has 67K kilometres on the original motor and turbos, all vacum hoses have been replaced with silicone ones. ive got a full intake, IC, 1300cc secondaries, full straight-through exhaust, apexi pfc, defi guages and greddy profec-b. lets pray that i get this figured out soon

oh... and i have racing beat wires so i dont think its them

 

ok i changed the plugs and reset the ecu but still the same prob... any other ideas???

 

check your MAP sensor. please dont ask me what it is just SEARCH.