I have a 2004 deville that has under 70,000 miles on the Northstar engine. This car is truly a car for Church on Sunday. The problem is the car began to stall. I took it to the shop and was advised it is losing compression. The car was tuned and I was advised that if the compression continues to drop, then I needed to replace the engine. What replace the engine that has less than 70,000 miles what a bummer. My thoughts (being a woman) is clearing the fuel line would help maybe clear some of the gunk that might have accumulated due to lack of driving. I put some fuel and carb cleaner to help remove gunk but it continues to stall, any suggestions, I truly need help. I feel like repairs guys are trying to take advantage of me due to my gender. Please help.