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01 4.2 with bad mpg please help

3K views 2 replies 2 participants last post by  ctkunka 
#1 ·
i had to cut my cats out and staight pipe. cats had backed up and cracked the heads and block. i put a new motor in and it drained the bank. now my millage has gone to nothing i have lost over 100 miles to a tank. is there a cheep fix to getting my milage back other than putting the cats back in. if anyone could help me that would be great
 
#2 ·
I wonder if the PCM is adjusting itself because of the 02 readings pre- and post-cat.
 
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