When I give it gas it acts as if it can't take it. Almost like it needs a tune up.
When I start the jeep it runs fine, when I pull out and even at road speed it has surges. Sometimes it will be smooth for a mile or two tops, then its acts almost like a miss in the engine. But I have change the plugs, wires, cap, and button. So I do not think it is that. I thought it might be the fuel filter, but can't find it. Maybe the fuel injector, or the screen on the fuel pump. Does anyone have any ideas.
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Need to road test with scan tool on it & look at data
Need to confirm the temp issue & what your saying
Need to see fuel pressure & if correct, what it is at 200 when the issues start.
Maybe the egr comes in later & leans it out
Maybe it won't stay in closed loop & that is temp related for sure
Think you need to go for a road test,you drive & shop guy rides with scanner,have to be part of the solution or they will sell you spark plugs & call it a tune-up,remember they have been gone for 25 years
This sounds like the same problem I had with my 87 Jeep 2 door Cherokee Sport. Thought I had to replace the Fuel pump yet when I went under and pulled it out of the side of the tank I found that one of it's vacuum or return line had fallen/poped off. After I pushed the rubber tube line back on it's metal tube and pushed and remounted the pump back in the tank. Started up and it never ran better at any speed. Yea!!!!!
I would change all the fluids and either try dry gas or i would recommend that the gas tank be thoroughly drained and new gas put in the tank.If you have a hard time getting started try to use starter fluid in carburetor or if you have none just use gas. If the vehicle is equipped with fuel injectors locate air filter and follow air duct to engine that is where starter fluid or gasoline will have to be pored to prime the injectors.if it don't start the engine should be tuned up with a major tune up replace all filters ect even if it starts without tune up i would tune it up asap!
I would say the connector may have an issue, either it is not locked into the tank connector or the connector terminals are loose or corroded, also u didn't say if the just the electric pump was replaced or the entire fuel pump module which comes pre wired. By all means I would take it back and have them look at it, they should do this for free is they are not a fly by night shop.