You can liisten closely to the exhaust for a hissing, or ratteling sound. Also, see if there is a lot of pressure coming from the tail pipe. Last case, you can check back pressure with a gauge.
As far as the fuel pressure, you will need a fuel pressure gauge. Most nationally recognized parts stores will rent or lend them. It will hook to the fuel rail, and you check the pressure right from there.
Let me know what you find, or if you have other questions.
NOTE: If the converter is bolted on, you can temporarily remove it to see if that has an effect on the engine.
Monday, February 2nd, 2009 AT 6:49 PM