My 96 regal custom,service engine soon light is flashing.it showed that number 2 cylinder was misfiring,so i replaced the plugs,wirers and that coil.but to no avail.

The only way a code reader works, is if the check engine light stays on continuous, There cant be anything drastic,Because light goes out. God-Bless!

well..fuel injection systems are more than the electronic part. I suspect you are dealing with compression or injector fouling issues..

it can be a number of things ---have vehicle scanned a blinking check engine usually means a misfire with 1 or more cylinders most auto stores offer this service for free --with misfire can be plugs -coils-wires-bad gas --throttle body fault--fuel delivery problem etc

P0304 is engine misfire #4 cylinder Several things can cause a misfire #1 electrical which you have covered #2 Mechanical Test engine compression is should be around 150 cranking and 120 running . internal valve train components can cause bad compression and the valves then self. #3 fuel injector can be the cause suggest swapping with a know good cylinder and see if misfire follows injector.

www.engine-light-help.com/generic-engine-check-light-codes.html

When the light comes on without flashing, it just means an emissions problem, when it starts to flash it has become more serious. I suspect that there was an error putting the plugs and or wires. That computer can determine if there is a misfire and it will put out a P040X, code where X represents which cylinder is the problem. This will help you not have to take each one apart. If there are more than one, check each number.

Ex. P0401 means there is misfire on cylinder number 1

P0400 is a random misfire detected.

If you take it to an Advance or Autozone they will usually scan if for free.

By the way, if you used cheap plugs instead of platinum plugs that could do it too.

Hope this helps.

the light is flashing to tell u that the engione has one or more engine cylinders misfiring, have the trouble codes tested to find out which cylinder(ws) is he problem.

u have 2 bad coils

Cylinder number 5 is misfiring. Check spark plug, spark plug wire and ignition coil for the number 5 cylinder. The number 5 cylinder is the closest to the front of the car on the drivers side. With engine running in dark (at night) take a spray bottle of water and lightly mist spark plug wires and coil and look for arcing. Autozone will test coil for free.