Here's my dilemma: Basically, I experience abrupt stalling w/o consistent or advance clues. Some have suggested my car has an "old/poor" gas problem that has messed up the fuel pump, filter, etc. etc. It also acts electrical - like someone unplugged the engine and everything ceased. It was very startling when it first occured. This 1.9 engine, 1998 Z3 has been perfect for over 8 years. Like others I've read about, it too has never been driven in wet weather. 22K on odometer, everything near mint. The car was parked in Oct. of '07 just like every other year. I had approx a quarter tank of gas; no Stabil or other product used (unfortunately). First time out in May, stall problem occurs; both while driving and stopping. Now, car will backfire (CEL comes on) and quits (unless revved) on start-up; easy driving (all speeds); and during accelleration between shifts. But then again, there are small trips with no problems. MPG is presently at 26.3 @ 70 mph - seems ok but should be better?.?. To date, ran two treatments of Techron with two gas refills. Also, used one small bottle of dry gas agent. Cleaned plugs (little brownish/dusty color, with some carbon around top of threads. Also clipped a few vacuum/rubber hoses at tips (top side only). Unscrewed some connectors to check for oxidation (very slight if any). I'm cautious about clearner -but intend to do. I did change fuel filter - noted much less restriction as I blew through new and old. Also changed o-ring on camshaft position sensor (oil leak has stopped). If the car does not rapidly drop/stall-out on starts, I am able to drive for about 8-10 minutes before the problem becomes evident. Recently saw some carbon spatters in tail pipe (has always impressively clean). Rubber gasket around locking gas cap is lightly wet w/gas. This thread is current (7/17/08). I have posted individual threads on forum as part of my DIY efforts. Thanks for tips. All suggestions will continue to be welcomed. I will share the end of my journey. I believe in prayer - send one my way if so inclined.