replacing a heater core on a 07 grand prix which according to mitchells calls for 3.8 hrs , 8 hrs later and the dash in pieces finally removed heater core. am i missing something or is this just a mistake in the labor guide.

NO TROUBE CODES AT ALL EITHER TIME. NO BLOCKAGE IN EVAP OR VENTING LINES.

HAVE A GMC YUKON ORIGINALLY WAS TOWED IN WITH THE FUEL TANK PRESSURE SENSOR BLOWN OUT OF THE TOP OF THE SENDING UNIT. VEHICLE HAD LOTS OF MILES SO WE PUT IN A GM OE SENDING UNIT IN IT IN AUGUST. VEHICLE CAME BACK TODAY OCT 10 WITH THE SAME EXACT ISSUE. NO DTC'S IN THE COMPUTER, EVERYTHING SEEMS TO B...

this truck has the strangest vibration while braking. truck has new pads, rotors, calipers on ft and rear brakes check out goo. drums have been machined. this truck shakes like mad at the end of braking almost all speeds over 40 mph.

please offer tips/info if you folks can.

thanks!