So, I have looked on this site for symptoms similar to what I have and have found a few, but after a while there are no answers. I am posting this as a need help that may turn into a tech for diagnosis of this very common problem.
Symptom: 65000 miles original.
The truck does not like to idle with a thermostat in. It will bog itself down and eventually cut out loping high idle, extremely low idle (low enough for oil pressure light to kick on occasionally. After about 10 cycles it dies out, what I am assuming is the Idle control motor clicks 3 times and then all you hear is the radio and the heater lol. It used to do this only 2 or 3 times before staying lit and would blow white smoke and just smell toooooooo rich in the exhaust. I took the thermostat out for a while and no problems anymore. I had to put it back in when my pregnant wife, gonna have another boy, blew her Grand Cherokee's #6 piston into fragmnets. So we got a car for her to drive as prego and lifted truck don't go well together, and I let it sit as it is my clunker for junkyard, sanitation yard, back yard, and long yard truck. Started it up to go to Sears and get my wife her new fridge and on the way it was acting like it had bad gas. So went to the gas station, got a half tank ran some HEET through it and we took off. Not long after I left out of gas station it started doing the same thing
As you would press the gas down it would lunge and then act like it wasn't getting enough gas even at WOT.
It would stall on deceleration, and it would not stay started unless throttle was feathered and slammed into drive.
I thought Eh sounds like the TPS has a flat spot and since I was getting error 13 I thought what the heck Ill buy the map sensor as well. Got home checked the hose no leaks to MAP, none others really checked will check tonight for the other vaccume leaks in hoses right now, more on that later. So i replace the sensors,white smoke and smell go away, WOOHOO, and so I decide to drive it around the block. No problems, till I have to stop by the high school and it starts loping again and tries to stall out. I heavily feather the gas to get the truck limped back to the house and park again. Last night I go to Dairy Queen and take the truck after a couple days of being unplugged from the battery to reset the PCM. Runs great until I have to get into traffic. Needless to say same problem however, it has no hesitation at WOT.
Done so far:
Cleaned the injectors
Poured HEET and cleaner through the gas line
Changed TPS and MAP sensors, checked map hose
Ran carb/TBI cleaner through the intake multiple times
New cap, plugs, wires, not rotor though will change it once the old one will come off.
EGR valve check or removal.(Reccomendations as far as power vs Mpg goes)
Check more vaccume lines
Idle control motor check
Check booster brake line.
Any thing else you guys can think of.
Check gas line pressure
Thanks for reading