98 cavalier sputters and backfires at 2000-4000rpms

Check that the coil is functioning; the coil wire is intact; also check the battery cables and connections, especially the negative ground to the chassis.

Does it use spark plug wires or individual ignition coils for the each plug?. My 98 intrepid uses coils and occasionally I have to change them out cause it would start to miss when normal temperature was achieved. If it uses wires, try replacing them, along with the spark plugs.

fuel injection area needs inspecting--the pulse may be bad or injectors filthy--have car scanned and chec for vacuum leaks--------did u change the plug wires-they rot from inside!

i had a problem with my throttle positioning sensor and mine did same thing part was only 11 dollars took 2 minutes to change in my driveway

buy a couple bottles of gasline antifreeze (it absorbs water). add one bottle to your gas tank now and another bottle next time you fill up. you should notice results almost immediately.

robert

make sure timing is dead on ignition timing make sure the fuel filter is not clogged
Does it have 1 fuel pump or 2 check both if it does
check the coil packs

change the air flow meter thats your problem.Good luck

Have the catalitic converter check sounds like it may be clogged. This will cause it to choke off exhaust when it gets hot

hi april, it sounds like the camshaft position sensor is failing!...question?, does your temperature gauge work normaly?, is there any check engine lights on? if so let me know the code number and i can help ya! good luck, marty

check the map senser