I HAVE A 2004 IMPALA 3.8L, 105K MI.COLD STARTS PERFECTLY NORMAL AFTER GETTING TO NORMAL OPERATING TEMP. ,AND CAR SHUT OFF FOR 30 MIN TO ABOUT 1 HR,CAR WILL START BUT STUMBLE AND SOMTIMES STALL BUT WILL ALWAYS RESTART, NO OTHER DRIVABILITY ISSUES CHANGED VERY DIRTY IAC.CLEANED MAF AND EGR OF COURSE NO CEL CHECKED FUEL PRESS,AND REGULATOR ALL NORMAL.LOCAL MECH SAYS POSSIBLE INTERMITTANT CRANK SENSOR BUT I'VE RED CAM SENSOR WILL CAUSE WARM START/STALL AND IS A LITTILE EASIER TO CHANGE ,IF CHANGED MUST A RELERN BE DONE AND HOW. THANKS FOR ALL HELP PETE
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