rough idle when hot on nissan ga16 engine.?

KenS

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Ive' tried to replace distributor, serviced idle air sensor, changed spark plugs and wires, changed fuel filter, air filter, fuel has good pressure. So what's the problem??
Please help The problem happens now and then. Not on a continous basis, that's why troubleshooting is difficult. The engine rpm decreases and sounds heavy on the muffler, if a/c is on, engine stalls because of lack of power. Please help!!!
 
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