My cherokee starts missing in the morning when i first start to drive, even when its not cold out but the engine is still not quite warm yet. It also does this when its warmed up, just not so no bad. I can hear a vacuum leak somewhere and it gets higher pitched the closer i get to a shift point (driving in city speeds)then goes down when it shifts. It is only apparent when it is under load driving, even slow acceleration. The symptoms are a weird miss like a stumble at 2000rpms exactly(i thought tps, but it got tested 2 times already), now at cruise speed this sucks, cause that is the rpm for my jeep at highway speed. When it misses at highway speed it really is annoying.
New parts so far: o2 sensor, egr valve and solenoid, plugs (plats), wires, cap, rotor, fuel filter, 12v relays, ccv, 2 scopes on computer diagnostic, 2 electrical scans, tps tested twice.
i have a 90 cherokee auto, inline 6, 4x4...please help me solve this dam thing, its only been like a year now. thanks everyone for help, any info left out please ask
New parts so far: o2 sensor, egr valve and solenoid, plugs (plats), wires, cap, rotor, fuel filter, 12v relays, ccv, 2 scopes on computer diagnostic, 2 electrical scans, tps tested twice.
i have a 90 cherokee auto, inline 6, 4x4...please help me solve this dam thing, its only been like a year now. thanks everyone for help, any info left out please ask