running strange

[tonyjklh]

ok lets see if i can explain this clearly or not. sometimes the truck runs great and strong but then there are times where i just barely push the gas peddle and it studders like crazy! even times where it will just keep studering for 30 seconds before it finally starts going again. also dies randomly sometimes. i have changed all the basic items(spark plugs, filters, etc), i have also changed may of the sensors, the pcm, and the ignition module, also had a spare coil pack so i changed that as well. nothing seems to be working?? many times i will push the peddle and the engine will get up to 1800 rpm driving fine than just drop down to like an idle speed and then pick back up again. also i dont know if this is realated or not, but while driving down the freeway in OD the truck will sometimes start jerking real bad, is that the same problem? or is it a transmision problem? oh the truck is a 1990 4X4 4.0L about 150,000 miles.
thanks for any help

 

[exotic_4x4]

Yeah I have an 04 that just started doing this same issue as yours somedays it runs great no problems but yesterday my truck is missing and has a choppy idol like yours, anyone have any thoughts? I did a fuel filter plugs wires and cleaned my kn airfilter.hmm

 

[modelageek]

Yeah I have an 04 that just started doing this same issue as yours somedays it runs great no problems but yesterday my truck is missing and has a choppy idol like yours, anyone have any thoughts? I did a fuel filter plugs wires and cleaned my kn airfilter.hmm

clean- Throttle body, IACV and MAF

 

[RUTH]

im chassing this same problem in my B2 4.0 swap.... and mine seems to doit worse on hills like a fuel pump problem, like its harder to pump the fuel up, but its not

 

[exotic_4x4]

Mine was a bad electrode on my plug, put a new one in ran fine...also if your trucks sluggish goin uphill fuel rail issues are pretty common on these I had mechanics say

 

[RUTH]

i have got new plugs and wires, and i changed out the coil pack off of a good runner as well and still no luck, thought maybe it could be the fuel boiling, but i took it out again today to hopefully track the problem down, started doing it so i popped the hood felt all around the fuel lines and they are fine... once again it runs fine for a while, once it gets up to temp starts to run bad and cant go to full throttle or just falls on its face... if i shut it off for 10 min it will be fine again for a bit????????????