miss whenfirst started
I have a 3500 chevy single wheel drive. I noticed I had a miss when I first started it and when I drove it 5 or so miles it seemed to go away. Now it is getting worse and when you don't start it for a week or so it is really hard to get started again. I had a tune up, when I first noticed it, and it didn't help, plugs cap rotor and wires. The shop just gave uo any help??