I am at my wits end with my mj! I have this rough idle/rich condition that i cannot get rid of. To go with this, am getting 12 mpg. When i first start the truck and try to take off, it just wants to die and spits and sputters at low rpms. High rpms seem to run alright, but not quite the amount of power that i feel it should have either. When it gets up to operating temp, it idles better, but still noticeably rough, and i can feel it jiggling the truck.
Here is a list of what i have changed in the past 3 months:
IAC, TPS, Map sensor, coolant temp sensor, crank position sensor, oxygen sensor, Vacuum harnesses, Fuel pump ballast resistor, fuel pump, ground for fuel pump, fuel filter, spark plugs, intake gasket.
I am just totally puzzled and don't know where to look next. The motor is a remanufactured engine with roughly 20k miles on it(the guy before me installed it though). I have checked fuel pressure and i have 31 psi, and when i unhook vacuum line from regulator there is 39 psi.
I don't know what to replace next. If anyone has anything that could lead me in the right direction that would be great. Thanks in advance!
P.S. my truck is a 1988 Renix.
