1998 Chevy Malibu ENGINE MISFIRES

I HAVE A REALLY BAD MISFIRE IVE TAKEN IT TO A MECHANIC AND WAS TOLD IT WAS THE CONTROL MODULE WE CHANGED THAT AND 5 MONTHS LATER IT CAME BACK AND NOW ITS WORSE I DID A SPARK CHECK IT WAS OK I PUT A NEW CONTROL MODULE ON IT AND NOTHING CHANGED. I CHECKED THE COILS AND BOTH CAME OUT FINE. I CHANGED THE PLUGS AND STILL NOT RIGHT IT WILL START BUT IT JUMPS REALLY BAD AND MISSES CANNOT GIVE IT GAS OR IT WILL BACK FIRE AND CUT OUT.
PLEASE HELP