Rough idle and little throttle response 4.0 inline 6.

325

Asked by Jan 20, 2017 at 08:38 AM about the 2003 Jeep Grand Cherokee Laredo 4WD

Question type: Maintenance & Repair

Got gas at a marathon station, which I usually don't
do, and then drove about 20 miles to school with
no problems. After sitting in the parking lot ideling
for about 20 mins it started to rough idle on one
cylinder, then multiple cylinders. Tried giving it
throttle and it I had little throttle response, once I
got to rev up to 3k, I held it there for about 15
seconds and it was fine after. It has had spark plug
issues in the past. It also was raining when I got
gas. Any help would be great.

1 Answer

725

Maybe low quality fuel, some water, debris, it happens. Check the fuel filter and the tank at best if this happens again.

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