My Trooper always starts up right away, but after it has warmed up a bit it wants to quit and runs ragged at idle. It has 160K miles. I have replaced the distributor, and plug wires. It also has failed the California Smog test (too much Nitrous Oxide). Any Ideas
1990 Isuzu Trooper 4cyl
Generally it is a good idea to replace the spark plugs as well as the wires. You could check you ignition timing since the distributor was replaced maybe it has come loose. This is where I would start. Post back what you find.
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