RUNS VERY BAD FOR ABOUT 20 MILES AFTER SITTING 2 DAYS on 2002 Buick Rendezvous

IF I LET IT SIT FOR 2 DAYS IT WILL BARELY GET 30 MPH FOR ABOUT 20 MILES THEN IT RUNS FINE UNTILL I LET IT SIT OVER THE WEEKEND AND IT HAPPENS ALL OVER AGAIN THANKS . JERRY REPLACED O2 SENSORS AND FUEL FILTER

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