i have a 2004 gtp with 153,000 miles on it. it has ran flawlessly since new. last week on the interstate i stepped on the gas pretty hard and it made some noise. i drove it to the shop that has always serviced it, they hooked it up to the scanner and it said the # 1 cylinder had 57000 misfires. compression check showed no compression. also sparkplug was smashed. valves are intact. has anyone else had this problem. if i replace the engine does it have to be a series 3 . will a supoercharged engine out of a 2002 buick work thanks
