At an educated guess one cylinder is working (getting hot) and the other has a valve problem allowing the backfiring. Check valve settings or remove the head and check for burnt valve.
SOURCE: rough idle
Clean the idle air control valve in the throttle body and you should also check fuel pressure and test the throttle position sensor. Another thing that you will want to do is to check the timing.
SOURCE: Have a 2000 Plymouth neon (4 cyl, 2.0) with loss
Did this backfiring start after the tune-up? If yes, check firing order of plug wires. Also , if you paid someone to do this, have you consulted with them regarding the way the vehicle is running?
SOURCE: My 1991 Jeep Wrangler, 4
could be the cat.but i would look first at the egr valve and the vacume lines that run to and from it,and vacume test it to see if its working correctly.
SOURCE: 2001 Pontiac Grand Am SE
change the spark plug wires , but before you panic,, did you ever get the codes cleared? if not do that ,,
SOURCE: 96 chevy silverado changed plugs and wires now it backfires why
you cross two of high tension lead for the spark plugs.
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