Replace ignition system, start with coils, and coil pack housing under engine top cover. The plastic coil cover may be arking out. some people will tell you to look for "spider webs" on the plastic cover, don't you believe it!!! They go bad quite ofter and cost $50 a shot. also check your plugs, ONLY use autolite or ac delco REGULAR plugs, avoid bosch AT ALL COSTS.
SOURCE: 2002 alero 2.2L
There are many things that can cause this problem and it would take too long to try to diagnose without the proper equipment, I.E. OBD2 Scanner. There are just too many engine controls that could cause a misfire. You will have to take it into a shop for an engine diag. This will probably cost you in the range of 150-200, this price does not include the solution, that is entirely seperate. A scanner needs to be hook up to zero in on the problem area, and from there the problem can be tested appropriately.
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