runs good then idles rough and won't take gas. No check engine codes.??????????? on 1997 Acura TL

Im and experienced mechanic 20+ years but this car has me baffled. Will run great for 5 to 10 minutes then starts spittin and idling rough. then will not take gas and has no check engine codes. Any suggestions welcome.

by in Oxford, NC on October 11, 2012
3 answers 8 comments
ANSWER by , October 11, 2012
what is the fuel trim readings and how long since fuel filter was repl
COMMENT by , October 17, 2012
Snap on monitor doesnt read fuel trim. Any other suggestions? Fuel filter has been replaced.
COMMENT by , October 18, 2012
With a manual vacuum gauge at manifold vacuum port , what are readings cold start /running good , then what does the needle do when it's acting up , especially when trying to give it some throttle? And just to be clear on your other response , you did try with a leaking exhaust (before the converter) to see if that made a difference?......Remember , we are not there in person so it's a little trickier , without some info. Just trying to help.
COMMENT by , October 19, 2012
Thanks for all your help but we decided to let them have the car back.
COMMENT by , October 19, 2012
You're welcome, sorry we couldn't help more.
ANSWER by , October 11, 2012
i would check fuel pressure, also does the car sound muffled
COMMENT by , October 17, 2012
Fuel pressure was checked. Any other suggestions?
ANSWER by , October 13, 2012
Also possibly check mass air flow meter for contamination , or any leaks in the air intake system (poss. cracks in hose) While watching fuel trim(#1) , watch MAF reading. ....Any sign of restricted exhaust? (vacuum gauge to test - or (less recommended) create exhaust leak before converter and test drive? Is the knibbler pin and muffler bearing OK?
COMMENT by , October 17, 2012
Done all this. Any other Suggestions?
COMMENT by , October 17, 2012
seek help obviously u are missing something or its something else
COMMENT by , October 18, 2012
What kind of 'snap-on' monitor would NOT read fuel trim ...curious.