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The mechanic should check on the distributor assembly and the spark plug ,spark plug cable. You should set first the distributor shaft rotate it counter clock wise or clock wise . according to the way you will set the spark plug to connect on the distributor assembly. If the timing will be 1342 there for the timing on the shaft should be set at the 1st spark plug and spark plug cable. When you hit the gas pedal it will back fire because of the distributor assembly and the spark plug is not set on timing or proper timing for compression.
The mechanic should check on the ignition system first . Check the ignition switch, the ignition coil , the spark plug , the spark plug cable , the distributor assembly and the wires and the fuses.Check if there are worn out or destroyed then replace it. And then set the distributor timing mark and the firing order of the spark plug which is 1,3,4,2.These 1,3,4,2 are the number of the spark plug connecting to the distributor assembly.Then try to start the engine .The cause of the engine back fire is ignition timing not in order.
ALL YOU NEED IS 3/8 RATCHET WITH A 5/8 SPARK PLUG SOCKET.YOU NEED EXTENSIONS AND UNIVERSAL JOINTS TO GET TO HARD TO REACH PLACES.YOU NEED A SPARK PLUG GAUGE.YOUR SPARK PLUG GAP SETTING WILL BE. 0.060 THAT WILL BE FOR THE 2.2 AND 3.1 ENGINES.
Sounds like a ignition control module failure. Check for spark at a spark plug wire. No spark then suspect module failure. Good spark-- Suspect possible fuel delivery problem. If spark is good then fuel pump may have failed.
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