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have you replaced the coil pack/ignition coil. remove the plugs and check to see what colour they are this will help determine what could be wrong. you could have carbon build up this would give pre ignition ie backfire this would limit the the bang . use some sea foam this has worked in all engines i have had. take the plugs out an pour some in the cylinders and put the plugs back in. and leave for an hour. then use the rest as indicated using the air intake vacuum line, should remove the build up.
Hi!!
Check fuel pump pressure. Borrow a Fuel Pressure Tester from AutoZone, Checkers or similar auto parts store, they will also provide the proper operating pressure of your fuel pump. Here is a diagram on how to hook it up.
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Have your fuel pressure tested, sounds like pressure is low either from plugged fuel filter or faulty fuel pump, or both. Takes about 10 minutes for mechanic to test it, then you can start from there, if, or if not fuel related.
Sounds like a vacuum leak in the motor. Backfiring may be its own problem altogether. Backfiring only occurs when cold air is being introduced into a hot exhaust stream or when the timing is off. Check for vacuum leaks under the hood and leaks in your exhaust. If you have a leak in your exhaust it could be interfearing with your emission sensors and giving your motor false information.
check the fuel filter to make sure it is open/clean also check the fuel pump pressure to make sure it is okay? check for air leaks in the fuel lines for lose hoses connections and fuel it getting to the throttle body
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