You said you cleaned the fuel distributer... Did that require removing the throttle body? I hestitate to dig to far into it, but I'm definitely game. My distributer governor has been replaced. The fuel pressure regulator has not. When I press down to adjust the allen bolt to adjust Lambda the bolt tends to stick down and I must "fiddle" with it to get it back up (good southern term).
I'm all ears (eyes in this case...) as I'm going to TRY to get it solved this weekend.
88 BMW E32 735i (make it go away)
95 Volvo 960 "Inga" (valve problems)
95 Nissan Maxima (the indestructible)
89 Ford Ranger XLT (ugliest truck in the South)