Hard or NO start???? Big diffrence!
MMMmmmmm.... Strange, i suspect AFM (Air flow meter), bad ground, coroded
wires. Check the FI wiring carefully, plug by plug. For sure you have an FI
(Fuel injection) problem. A loose sender, Idle stab connection....When hot?
mmmm....

I hope compression is OK, first thing to check. Bad start when hot is a sign
of low compression, mostly on carburated engine, not FI.

I wonder what others have to say about that, i have to check the Bentley, i
will find your problem.

Cheers, Ben
http://www.benplace.com/