CPS

Hello has any one took the cps and cut the bolt holes so could avance the timming.And what are the pros and cons of this and did it help figg avancing the timming would help .I have a 92 4.o HO with 5 sp .Trying to get alittle bit more milage out of it getting around 14.5 avg now hwy and city driving .going to try electric fan 99 intake manfold ,hi flo cat and any thing that will help milage any info will help

If I were you I would start to look at my vacuum lines and sensors something is not right. I am getting 17mpg and higher with my stock rig.

My try checking them first going to change the o2 first had ploblems before with it . My rig is stock also. Any other info any body has on performance helps