Have new cap,rotor,fuel pump,fuel filter,spark plugs,map sensor,throttle position sensor,aic sensor,pcv sensor. it starts then after couple minutes it backfires through air box.
SOURCE: trouble starting, keeps cranking, backfires,replaced
if you at any point have changed you´re timing belt you might have timed it a tooth or two of
SOURCE: Service Engine Soon Light and Rough Idle (Below 1200 rpms)
do you get check engine codes?..have you done a leak down test and compression test to determine mechanical engine health?
SOURCE: Shakes while idling and sometimes stalls.
check for minor vacuum leak and map sensor,pcv,egr valve
SOURCE: 1997 Blazer no-start
sounds like youve really done your home work all that comes to mind now is try a cam posistion sensor this would keep your car from starting as well if that is good you can aslo try a crank sensor. you will get all of the readings that you are getting and these sensors can still be bad.
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