[phat87mazdarx7]

75% of the time, no codes, when codes do come in its 1 or 2 cylinder misfires then multiple cylinder, no fuel at the reg, and no vacuum leaks I can find, Sprayed intake with starter fluid as it ran, no change in idle or anything, I'm gonna check out the temp sensors, I saw in another thread the intake temp can get screwy and make it act like this as well, so I'm gonna let the car sit over night and see how close to ambient temp the sensors are reading.

It ran fine when we first got it, it was a northern car so it has a decent bit of rust on it, my dad recently changed the fuel filter but has been scared to mess with it due to the rust on the hard line but when he did it he said it came out just fine. other than that no major work has been done, and the filter didn't help the stumble. stuff I tried.. replaced very leaky valve cover up front, hoping the oil was somehow causing the miss, but nope, removed the metal insulators on the plug wires, no change. I did notice on occasions when the idle got rough you could hear like an arc jump, but felt the wires and never got a shock,


I cleaned the injectors tried unplugging sensors 1 at a time to see if it would correct it(MAF, Map, TPS, Idle air, EGR) it had a bad map sensor but its been replaced with a used(aftermarket replacement, with no change, a bunch of the factory ones were separated at the seam.) and the starter fluid to check for vac leaks was after that, because that was a small vac leak before I replaced the sensor. I pulled the egr and put some carb cleaner in it to see if it was sealed shut and no leaks found, I'm going to pull the MAF and air temp when my dad gets home and clean them, see if any improvement comes from that. and I haven't had a chance to check the fuel pressure yet, but the regulator isn't leaking. so if any issue there its the pump