coincidence??
Filled up with gas and a few hours later was hard starting. Put in some injector cleaner and drove it around for a half an hour, all seemed fine except I noticed that it did not always upshift normally. I could manually get it to upshift.Let it sit a few days and it started right up, went for a ride and ran fine, still not always upshifting as it should. It is a 2008 Roadster. Hard starting and not shifting a coincidence??