so i was driving away from a friends house and just for some kicks i gun it and get it up to 80 and then come to a stop and then it starts to studder and have no power then it bucks a little bit when startingoff in first, but not always just some times. it takes for ever to getr to 60 mph but the motor sounds fine like no noises out of the ordinary cant get it to rev over 4k and breaks ups some at 3600-3900 (normal hesitation i guess just magnified) and my air fuel guage says full rich.and my boost guage is reading 10-15 vacuum (its na not turbo)and it usually reads 22-25 at idle then 1 or 2 at full throttle. im thinking my afm or ecu as of right now but i have never heard an engine with a popped apex seal either so thats also an option but like i said i heard nothing and no sounds from motor. also since i gave it full throttle and then lets off quick do you think a injector stuck. need some good help on this i havent tried anything but my o2 sensor..

thanks in advance
wes

 

could also be my tps maybe the variable resistor in it gave way

 

First - You need to do a compression check.

 

i know but any other things to try

 

sounds like tps

 

well now they is a slight whining noise in the engine bay , and my hood wants to be gay and not open now so i cant hear it to well but i also think a apex seal might be stuck likt the spring is compressed and not sealing so im going to put some trans. fluid in and see if it will lube it up and free it and if not a friend of mine is a mechanic at mazda dealer and we will comp. test it this sat

 

does a high pitch scrappping sound at cold start and i cant rev past 3800 and it backfires and sounds like a dirt bike and subaru mixed

 

check the compression.......

and Im sorry - boost gauge on the N/A......hehehe.......can't help but chuckle at that one

 

why do you have a boost guage in an NA?

 

definately check compression