Car has a skip and not firing properly on all cylinders
Before you go checking parts that aren't there, unplug each coilpack connector one at a time with the engine running. After unplugging a coilpack you should hear the idle drop. If you unplug a connector and there is no change in idle, that is your problem cylinder. You can then check to see if there is spark by removing the coilpack and touching it to a ground on the engine, you'll hear it click. If you have spark, check the spark plug, if the spark plug is good, it's most likely a bad fuel injector. You can verify a bad injector by doing a resistance test after removing the connector. Injector replacement is a nightmare on these cars, but it can be done without pulling the plenum if you're mechanically inclined. Visit www.zcar.com for more help.
truck is on dual fuel, when it runs there is no problem, also there is no reason when it starts acting up, sputtering, backfireing, sometimes will recver often will stall out , you may get it running again or not, most everything has been looked at with no sucess
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