you are not supposed to adjust the idle, ever. that is the ECUs job.
adjusting it , now, means you have lied to the ECU.
it wont ever be right again. leave that screw alone,
its a factory set
adjustement.
nice guess though, very carb like guess. Is common idea... sure...
its EFI. and has Idle speed controls.
if the engine misfires, (yours is) the RPM drops, the ECU tries to
raise idle 2 ways, by opening the ISC and advancing timing.(spark)
this can fail easy , if any EFI engine misfires.
what happens is the ISC has lost control..
lets use 1 example , 1 cylinder is dead, the ISC can NOT fix that. nor idle right.
the solution is to leave the idle alone.
and.
then fix misfire, than
last fix the ISC functions.,
but i get ahead of myself......
Did you do the 60,000 mile full tune up as listed in the oper guide?
no? well misfire is going to happen. (new spark parts and filters)
tune it up. if still misfire. we diagnose that 2nd, and fix it.
there are tests for each step. I can show you them, all of them.
there are over 50 causes of misfire.
here is a great list. and is not complete. !!!
http://www.fixkick.com/misfiring.html
one common cause is a leaky EGR main valve
now that guy is very pesky , even stalling engine
every traffic stop.
I thought these were fuel injected? in which case you might be better sending it to a garage
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