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Suspect (potentially) either a stuck injector, or a failed/failing fuel pressure regulator. One sign of a failed fuel pressure regulator can be gas in the oil. (I suffered that side effect, along with bogging, and black smoke rich running, worsening as warmed up, turned out to be fuel pressure regulator). If the injector is loose in the throttle body, or has bad o-rings, can also cause some wonky behavior. Good luck.
The TBI unit is going to be the route of your problem. Clean and inspect the insides of the unit. Next to the injector is the fuel pressure regulator. Either the injector pressure regulator has failed and is leaking, the o-ring that seals the regulator to the TBI has failed, or because of age and time. The housing itself has oxidized or cracked and is letting fuel leak into the throttle body. There are many different ways that the TBI unit can fail. An unmetered amount of air getting into the engine, low or no fuel pressure, or throttle linkage was sticking or broken, then there would be other symptoms. You provided a great description and list of symptoms. Please, when you have time, take a closer look at the TBI unit and let me know. If you have any other questions please write back and I'll do my best, good luck.
Check to see if the EGR valve is going all the way to the top upon hard acceleration. Also check to see if the fuel pressure regulator spring has broken inside the pressure regulator itself. Please note that if you decide to rebuild the regulator with a regulator rebuild kit the before mentioned spring will not be supplied in the kit that you will purchase. One more thing.. Check to see by chance if the vacume supply line for the MAP sensor is not restricted or stopped up with carbon deposits. It may also be stopped up under the throttle body itself which is easily cleaned out upon throttle body removal. Hope this helps out. "COOT"
check the iac motor(idle air control) this valve controls the air and fuel going into the throttle body during the truck idles aslso look at the vacuum going to map sensor for pin holes. iac valve is located to the rear of throttle body. map sensor is located in front under breather on throttle body. hope this will help!!!
Assuming it has a 3.1 V-6, it could be any # of failures. Bad plug wires, ignition coils, control module (under coil packs), crankshaft position sensor, map sensor, throttle position sensor, egr valve, fuel pressure regulator, fuel injectors, engine coolant temperature sensor, vacuum leaks; have it scanned for trouble codes to help in diagnosing! If you think it is just over fueling (flooding),look at fuel pressure regulator or coolant temp sensor ( when they fail the computer thinks its always -40 F causing it to over fuel). A bad map sensor can cause the same. Hope this helps. Thanks in advance for rating me!