your capacitors on your ecm may be going, i had similar symptoms when the weather was cold and when i changed my ecm they went away. a lot of people just replace the capacitors in the ecm and that helps too search brain surgery in the forum and you will find that. btw when you turn the key before firing her up does the check engine light come right on , if it doesnt then its definately yout ecm
ok, I have a coolant temp sensor on the way, should be here in the morning, I did get a noid light test set.
I'm gonna try the noid light after I get the ect sensor put in and see what I can find out in the injectors.
OK Que, installed the new ECT sensor, hooked up the battery and fired her up and hooked up the noid light, wife sat in the seat and had her throttle up to 3000rpms, as soon as I hooked up the noid light it was flashing like a strobe. Light never went out, even when it was in the bad zone at 3000. did the same thing on all cylinders none of the injectors cut out.
Wife said as soon as I unhooked the first injector the check engine light came on. I checked the codes and it showed code 27, pretty sure its from being unhooked but that all I have for now.
Have you tried unplugging 1 injector at a time while the jeep is idling. Just a suggestion. As you unplug one it should affect your idle. Plug it back up and move on to another one. If you get to one that doesn't make a change in idle. You have found your problem. 5 min test that might be worth your time.
Bedwards, it idles fine with no problems, It's a hard crank and when it get to 3000rpms it's like it hits a rev limiter, spits and sputters and drops power.
I've been following your thread and Stick with Que he will help you find it. It's just very similar to the problems I'm having. After a lot of trouble shooting and replacing some sensors. I did the unplug injector test. To find out I'm only running on 3 cyls. Misfiring when I get to 3000 RPMS and no power. My injectors are firing but nothing is getting through my #4 injector. Unplugging them was the only way I would have found out. Like I said they were all firing. Que will stick with you and y'all will figure it out. It was just a quick suggestion. Good luck.