Hesitating when accelerating from a stop

[kro10000]

My MJ has had this issue for several months now, but is now happening often enough to start me worrying. Occasionally when I take off from a stop, with light throttle the engine will cut out momentarily. Since its a stick it causes the whole truck to jerk, which is annoying.

 

I haven't done any actual diagnosis as of yet, it's a 4.0 renix, open filter, 2.5 exhaust with no cat/flowmaster 40. EGR has been unhooked, higher end borg warner cap, rotor, and wires (probably 25,000 miles on these), PO said he replaced O2 sensor recently when I bought it (about 35,000 mile since), fuel filter was replaced probably 7,000 miles ago. Champion copper plugs, standard heat range (not sure if I should run a cooler range with no EGR). There have been no recent changes to the truck, besides the axle swap (in December).

 

My guess is a fuel pump, but I'm interested in you guys' $.02

 

Also the ballast resistor is newer, but I think a slightly higher resistance than stock. Like 0.2 Ohms higher

[cody4359]

has your mpg dropped? it sound like o2 sensor to me but you said its been replaced recentley. maybe crawl under there and check the wires to make sure they havent fallen onto the exhaust and melted

[Rockyrider367]

Put an ohm meter on your TPS to. It may have a dead spot. My 2.5 was like that. Under real light throttle like 5-10% it had a dead spot. Computer didnt know what to do.

[kro10000]

Put an ohm meter on your TPS to. It may have a dead spot. My 2.5 was like that. Under real light throttle like 5-10% it had a dead spot. Computer didnt know what to do.

I may have to try that, I'll also do a visual on the O2 sensor. I wonder if jeep will still replace it since the recall was never done.