Ok so my car runs fine around town, but when I get into the throttle it produces boost, can see it on the gauge, but the car does not accelerate the way it should. And also alot of times it will miss, sputter, backfire, and bog down. So after checking all ignition components, plugs, wires, igniter, starter, map sensor, ecu, basically everything, I decided that it was suspicious of a leading coil pack, so I replaced it with a brand new one this evening. I installed the pack, reassembled everything, start the car and let it warm at idle and take it for a drive. But to my dissapointment and of course with my bad luck nothing has really changed. Now this **** is getting old, I have spent sooooo much money on this passion of mine with no good result. I have had this problem since June after having the motor built by Pineapple and upgrading the turbo's to 99 efini's brand new as well. My mods are: motor from pineapple, with new housings, rotors, slightly ported, and oil mods, m2 ecu, cosmo fuel pump, new oil injectors and lines, flowed and matched fuel injectors from Marren fuel injection, short shifter, m2 downpipe, greddy exhaust, ACT 9.5 lb. flywheel, RPS street clutch, timer, custom K&N intake, magnecore 10mm wires, NGK 8&9 plugs, fluidyne radiator, all vaccum hoses replaced, brand new 99 efini's and im sure I missed some things. Anyways I have had the car up and running since June, I have done everything myself along with a friend of whom is a rx7 guru, his being a single turbo 500hp monster, and me and him are both stumped. I like being a do it yourselfer and not relying on someone else to work on the car, but at this point what do I do?

 

Does it idle okay?

 

Maybe its a clogged fuel filter.... I heard sometimes acceleration response gets slow when the filter is clogged....plus...the filter is now like 11 years old....change it if you have to.

 

The car does idle fine and runs great under normal conditions. Only acts up under boost. And the fuel filter is new added in June as well......

 

Looking at the troubleshooting guide in the manual with what you described, it maybe a few things. The throttle position sensor, the secondary injectors, fuel pump, pressure regulator, and the oxygen sensor. I'd say start with the Throttle position sensor and adjust it according to spec. If not that, you might have to replace the other things one by one to see if it fixes your problem. You might want to try connecting the GRD and TEN in the diagnosis box in your engine bay to see if you get any Check Engine Light codes. PM me if you have any questions. I'll try to help you as much as I can.