well occasionally my car while driving down the freeway will jolt or sputter and today while idling at a stoplight the idle fell a few hundred r's and bounced between 300 and 500 rpms for just a sec and then started idling fine again...any ideas...recent tune including timing check new plugs, wires, cap, rotor, and fuel filter. Plus I use 76 gas 92 octane every time...oh and I park outside and have been usuing a water eliminator MOST tanks but not on this current tank plus a few tanks in the recent past I havent used it I can't remember but I'm not sure I had this problem while using the water eliminator so that could be it but what other ideas you guys have? fuel pump? something controlling the pump such as a wire short??