I have an 2002 Neon Le 2.0L non-magnum engine. When I do a full throttle acceration from 1500 rpm, the car stumbles. I change the spark plugs, used the correct gap; it sloved the problem for about a week. I changed the plug wires, it solved the problem for about a month. The Check engine light is not on and it never can on when the car was doing the stumbling and it is not burnt out. Please help with this problem cuz Johnny cop doesn't like when I leave the line at 2000 rpm to prevent the stumbling!

P.S a cheap cherry bomb glasspack gives the car a nice loud deep growl when you give it.

 

I would check(Clean) your thottle body and you may have a TPS problem. Also check for a vacuum leak.