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Rather then thinking ,test ! Do fuel pressure testing ,flow testing . Check factory specifications manual . View engine sensor data parameters ,if you don't know what these thing's are your best bet ,take it to a qualified repair shop . Could be a sensor is starting to go bad , crank , cam , dirty mass air flow sensor , coolant temp sensor , IAC - idle air control ,EGR valve sticking open , carbon etc....
clean the idler on the intake and also clean the throttle sensor, it would also be best to change the air filter and clean the maf sensor. Idler does more than just idle vehicle it controls low revs, and drop down from reves. throttle sensor tell ecu what air to add to the fuel. and the MAF tells ecu how much air is coming into the intake. also check for broken cracked vacuum lines.
You may be right, but if it is a sensor you should get a check engine light and a trouble code for the lost signal. Could also be something like a fuel pump relay or idle air control valve.
The crank sensor is behind the harmonic balancer. Not too hard to replace, the harmonic balancer is supposed to come right off but I needed a big 2-jaw puller to get it off.... accessed through the wheel well.
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