MY '01 PT CRUISER AT 97,000 MILES HAS BEGUN HESITATING WHEN I TRY TO ACCELERATE. AT FIRST I THOUGHT BAD GAS EVEN THOUGH I BUY FROM SHELL OR EXON. SO I PUT IN EXPENSIVE GAS, WHEN THAT DIDN'T WORK, I ADDED FUEL ADDITIVE. WHEN THAT DIDN'T WORK I PUT FUEL INJECTOR CLEANER ON EMPTY TANK BEFORE FILLING. I HAVE DONE THAT TWICE NOW AND STILL IT HESITATES. SOMETIMES I THINK IT HESITATES WORSE WHEN A/C IS ON. I HAVE HAD A TUNE UP LATE LAST YR OR EARLY THIS YR WHERE THEY REPLACED THE BATTERY, PLUGS AND CABLES. ANY IDEAS ON WHAT ELSE MY PROBLEM COULD BE?
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