1999 Jeep Grand Cherokee Laredo

1999 JEEP GRAND CHEROKEE
353,000 MILES • 6 CYL
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WILLIAM VICTOR NIEDZWIECKI
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1999 Jeep Grand Cherokee Laredo. Overnight, my Jeep began to "miss" badly; so I replaced the wires and plugs, but it continues to miss badly. What's wrong? I checked the Generator Field (OK); the Fuel Pump Relay (OK); and the Trans Voltage Relay (OK). What do you recommend?
Jan 14, 2011 at 5:09 PM
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DOCFIXIT
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Check engine light on ? if yes have codes read then post. AutoZone will do
Jan 14, 2011 at 5:20 PM
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WILLIAM VICTOR NIEDZWIECKI
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Unable to read the codes -- the computer(s) were bypassed three years ago by a mechanic in Andrew TX trying to solve a similar (but not quite) problem (that was eventually determined to be the use of synthetic oil). Any other suggestions?
Jan 14, 2011 at 7:31 PM
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RIVERMIKERAT
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The computers were bypassed? I'd recommend putting them back into the control loop and going from there. Missing can be caused by a bad coil, ignition pickup, control module or problematic valves. If the control modules are bypassed, the problem is probably in the pickup inside the distributor.
Mar 22, 2011 at 5:02 AM