Which Gas Should I Use

I have a '94' lincoln towncar with 112000 k on it and i put in premium gas but when i put in cheper gas it feels very sluggish. The catalatyic converter sounds as if there is a hole in it would gas affect the sound? Should i use premium,midgrade,or regular

I believe your 94 book calls for 87 (american) octane. The higher grades will clog up your EGR ports, and tube.

Check Here, (http://www.lincolnsonline.com/article15.html) for instruction on cleaning the EGR channels. It's very simple to do and you will be AMAZED on the performance afterward.

Thanx never knew about that i willl do it and get back to you with the progress. Thanx for the big help