car is running like shit!!
 

ok so heres the deal i drove my car to school this morning perfectly normal no problems as i was going to leave school the car started up but had no power violently shakes at idle will barely drive in gear almost like it has no throttle response or cannot meter incoming air ive searched the forum came up empty handed any help is greatly appreciated thanks it also doesnt sound like its running correctly this is for a friend

You didn't provide any details like year, etc... So based on your profile, check for codes: http://www.johnr.com/cpucodes.html.

sorry i just thought as i clicked on it its an 88 s4 manual transmission all stock

How to pull codes on an S4: https://www.rx7club.com/showthread.p...55#post5131155. It's not as helpful or easy to do as S5s, but it can aid troubleshooting.

I would suspect the AFM, the connection to it, or the pressure sensor/connection. The FSM fuel and emissions section has a list of voltages at the ECU pins, and what sensor they correspond to. If you turn the key to 'ON', and back-probe the ECU connectors with a multimeter, you can test individual sensors.

i built a tester it pulled no codes it does work tho cause i unhooked the pressure sensor and it pulled that code

could it be excess fuel to one of the rotors and its just over loading on fuel and not running correctly compression is good

Did you check the grounds on the flux capacitor?