On top of the new maf sensor/plugs/wires/dist cap/fuel filter/air filter/and strainer for the fuel pump i figured out that truck used to be a 89 v6 and this engine is a 90 22re not a 89 22re they only reason i think that is cause of the egr system looks like a 1990 and the vac lines were mixed up i rerouted them and it ran better but then i noticed that a rubber hose coming from the egr valve just lying there so i hooked it to the bottom of the egr vac mod it ran and then it choked out so i unhooked it and now it runs like **** at first and then takes off like a rocket and i noticed the cap and filter is gone of the egr vac mod IM RUNNING OUT OF MONEY can i still do a egr valve check or can i just eliminate the egr system
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This is because of the improper combustion, so you check the air filter, if the air filter is not good enough then the idling will go down and then the back firing will occur, in the same time check the Electronic ignition system for proper ignition cycle.
It could be a fuel filter, Mass Air Flow sensor, extremely dirty air filter...in other words a number of things. Check the air filter. If clean or ok then, while at idle, disconnect the MAF sensor plug and listen for a differance in idle speed or smoothness. This ONLY tells you the MAF is "doing something". lol. If idle remains the same, you'll know the sensor is a problem. (check a manual or the owners manual for exact location of the MAF sensor. It IS in the intake hose/filter box)
It also could be clogged/dirty fuel injectors. Try putting a name brand cleaner in the tank. Berryman B12, STP, Lucas, ect ect. and drive it (if possible) at least 50 miles. Let it sit and run if not drivable, keeping an eye on the temp. Some overheat on extended idle.
Good luck. :-)
possible egr valve problem,you can start with disconnecting the vacuun source to it and see if it rubs better but if its stuck open you may not notice any change,you can look underneath the valve with a light and mirror and apply vacuum to the valve and watch for the diaphram to move up and down,have you checked tec ecu for codes? if you need more info let me know have a good day DB