which engine? (asked now 1000 times, only 2 ever answered)tune up time
, spark parts, rotor to plugs. filters. both.
its called a 60k mile tune up solves most.
my guess, is its misfiring or
is this the ASD relay dropping
out then back in, as driven.
jerked before and after CKP sensor, did you know its the last thing to fail......
see the list of ASD drops.
misfiring, can be felt, its like a misfiring chain saw, ever here a 2 stoke misfire, ratta, tata ,tat?
some call it jerking, its not, is misfiring. (3reasons ) and 25 causes.
but jerkin real, like if you cut the ignition that is and instant bog.
but if you off the key and back on , fast, that be a jerk
that is total power loss. not misfire. its loss spark and fuel.
and jerks hard.
so does loss of 12vdc to the EFI system.
so the first step is to see if its the ASD relay dropping out.
on all jeeps.. 93 to now.
automatic, shut down. (relay and EFI logic)
key point, the ASD will kill the engine, if fit sees spark is bad.
so its a chicken and egg deal.
here is the logic.
key on , crank , ASD closes, fuel injects and engine starts
then dies in seconds. or runs full time.
note that if the ECU sees spark dead, it cuts spark.
Sounds odd , huh. but is NOT.
this relay stops all car fires. (caused by this protection not in place)