so my parents have and 03 avalanche with 125000 easy miles. my father was driving it in town the other day and it just started running REALLY rough. took it to a local family friend owned reputable shop. they put the scanner on it. missfires on all 8 cylinders. they pulled the spark plugs and all eight were soaked with gas. did a compression test. all were good except for one. no oil in coolant or coolant in oil. there pulling the heads on monday for further investigation. its kinda odd that all 8 spark plugs were soaked. he said it started doing it with out any warning. no sputter, shudder, shake. gas mileage was usual. any thoughts?
