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will this engine skip or misfire or shake at idle ?
ok so just when accelerating the light will flash but it feels like its driving fine?
if it wasn't for the check engine light coming on you wouldn't even know anything was wrong when driving it ?
ok and its showing cylinder 1 and 2 misfiring correct?
new plugs and coil made no difference at all ?
ok with new plugs and coils should eliminate a spark issue
and since its only under load I do not think you have a vacuum leak I think you are down to restricted dirty fuel injectors at this point
I would have a shop pressure clean them out with cleaner
this should clean them out for you
you eliminated everything else
there is an outside chance of the crank sensor causing this issue
usually you would have a crank sensor code
and ignition module would usually effect all the cylinders
How much do shops usually charge to pressure clean them? Or is it more cost effective to install new injectors?
most shops run @ $ 100 give or take
to replace the injectors would cost a lot more
some places sell them at $ 200 for each injector