I was having trouble starting the SL. It would start OK sometime. Other times it would crank like crazy without even a cough or sputter. I would have to wait an hour or so and try again. Then it would start. If you made a stop... like at a store for just a few minutes, the car wouldn't start unless I waited at least an hour. Now it will not start at all for the last 2 weeks. Cranks like crazy without a cough. Spark looks strong but not very blue. Any ideas on where to start looking before having to go to the $1000 independent?

PS. Yes, there is gas in the car.