About a month ago my car started jerking while accelerating and if i had my a/c on while in gear stopped then the tach would drop and jump back up to idle like it was gonna stall. I brought it into Autozone and 2 other car shops to get diagnosed and it shown codes of vaccume leak, cylinder 1 & 3 not firing and said weak gas pressure. I had replaced all the coil packs on the backside 1,2 and 3 with new plugs and replaced the pcv valve. After all that and about $240.00 later, my car runs even worse. Any ideas?