Alright, well I'm back again with another puzzle for you guys.
this is my 88 4.0 AW4 4x4. The following parts have just been installed in the past 2 months...
Crank sensor
Wires/Cap and Rotor
Fuel Pump
Fuel Pressure Regulator
Knock sensor (should be irrelivent)
Coolant Sensor in the block
MAP Sensor
EGR Valve will be here tomorrow
Alrighty, well since ive installed the new fuel pump alittle over 2 weeks ago the truck has gone from 2-3 seconds to startup up to 6-9 seconds, ok ive delt with it well, now its really throwing a fit to start, once i fire it up (2-3 tries) and its still cold itll idle itll run fine. Once it hits operating temp. it then slowly begins to fall on its face, starting at feeling sluggish all the way to backfiring through the TB and "misfiring"/idling like garbage...
The Oxygen sensor and spark plugs were just replaced back in Janruary but after an inspection of the plugs this evening the cylinders are definently loading up with fuel and the oil has a faint scent of gasoline also (oil change will be performed asap). The truck is not overheating on the gauge.
I'm going to throw a new o2 sensor in it tomorrow as well as my new EGR valve, but otherwise i don't know what else it could be. Thanks for any advice as always!