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I have the same problem on my 95 grand cherokee laredo. Sometimes it starts out fine and after about 10 miles it starts spitting and sputtering. Then after a while it seems to clean out and run fine again for a little while. Then other times it starts out spitting and sputtering at the begining. I changed the fuel filter and that was not it. It is a 4.0L 6cyc. Any Ideas?
Leaky EGR. Faulty plugs or wires. Vacuum leak at intake manifold or hose connections. With enginre running, wiggle all vacuum lines around and look for loose damaged or disconnected hoses,and listen for a hissing.
Do you have access to a multimeter and familiar with how to use it? Take a few minutes and remove connector at TP sensor, spray it off & inside with electrical cleaner, add some dielectric grease and see if it helps at all. You should find TP sensor on opposite side of throttle linkage on throttle body at front.