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I'm getting a code PO300, "random multiple misfire occurring" on our 1999 Ford Explorer with the 4.0 EFI engine. About 85,000 miles on it.
My son thinks we got a tank of bad gas, and water in the gas led to the computer code. AutoZone guy read the code, but he had no real idea on what could be causing it.
The plugs and wires are essentially new, with about 5,000 miles on them since they were installed.
Thank you for the help! I cleared the computer codes and ran two bottles of gas-line antifreeze through the tank. I'm keeping my fingers crossed that it was just bad gas or some water in the last tank.