All of a sudden I'm way down on power at low RPM's, really having to give it some pedal to move, it seems to have lost it's snap. After running on premium I did run a tank full on regular and as that tank was running dry, it started having this problem. Optispark/plugs replaced at 70K (currently has 83K); it's not blowing smoke or sputtering/hesitating, just gutless. It has been very warm in this part of the country (AZ), it was 114 today and it was running warm in stop and go traffic, but it never over-heated or anything. When I parked, I blipped the throttle a few times, and there was a slight hesitation before the RPM's kicked in. Any suggestions or guidance is greatly appreciated; thank you in advance for your time.

Peace.
Mark

 

Check you fuel filter.....might be the pump...

 

If you still have the regular gas in there that could be the problem. I could tell a huge difference when my gf put in the wrong gas.

 

might take a while but , you should cheek the wires,plugs , and the opti, by that I mean take it apart and look inside to see everything is good