i havent checked fuel pressure, i dont have a gauge. it does have a boush life time warrenty fuel pump put on last year.

300 code ? it has cyl. 6 misfire and o2 sensor the one after the cat

The one after the cat is nothing really, it'* only emissions. If #6 is misfiring then rich exhaust gas is getting to the cat and might have plugged it up.

i tought about cat, but every maechainic said it wasnt. they all say if it was the cat the car wouldny be able to go over 30. i went around to all the exaust shops and none of them will cut out the cat and replace with a straight pipe. how would i know if it was the cat ?

You can remove the front O2 sensor.

so i remove the front o2 then waht ? drive it to see if the problem is gone ?