[Lightfoot]

It looks like the first shop you took it to dropped the ball, big time.
Don't know if the M-A-F sensor was actually bad in the first place, but if it was, that should have cured the problem. And installing plugs&wires, etc. was clearly a case of throwing money at the problem, instead of actual diagnostics.
Usually if the M-A-F is failing, the ECM will put the engine into 'open loop' (limp mode) so that it can still be driven. Shouldn't just quit running IMO.

Sounds like burned valves indeed, have happened. If the pistons aren't damaged, a new head may be cost effective. But I would look into the first shop paying the bill, since they apparently ****ed up.

This forum may have a higher concentration of members that know these engines really well.
http://pontiacbonnevilleclub.com/forum/index.php

[Lightfoot]

Also, 109K is not extreme miles for the 3800. It's a well engineered engine, and should be good for a lot more use, if the short block has not been affected by this catastrophe.

With the intake being removed to pull the cylinder head, fresh gaskets should insure a fair amount of engine service life, after all the required work is done.

Maybe the service dept at your dealer can provide an affidavit that states the reason for the cylinder head damage was from the other shop's negligence. Small claims court will pay up to $1500, last I knew, but you should be entitled to all the damages being payed for.

[gtknapp]

Thanks for the advice Light. I appreciate it!