check timing belt/chain sounds like valves not timed properly, or not closing completely
it is a throttle
A fuel injector pulse is the product of an electrical charge controlled by the ecm to briefly open an injector. If the engine is throttle body injected, you would find the injectors in the throttle body.
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The TPS is the Throttle Position Sensor. One of the inputs a fuel injection computer needs is to know how far you've got the gas mashed. To do this, they put a variable resistor on the end of the throttle shaft and call it the Throttle Position Sensor, because they can charge $50 for the one-dollar variable resistor they used to make it out of if they call it a Sensor instead of what it actually is, which is a potentiometer they buy for $750 per thousand. To find this thing, find the place the throttle cable hooks to. It'll be an arm attached to a shaft sticking out of SOMETHING--an aluminum casting, a plastic tube, whatever. On the other side of the "something" you'll find a device with wires coming out of it, which is the TPS.
Take your vehicle to your local autozone if you have one, or some other autoparts store that can see what check engine light code is coming up on your truck. I am sure there is one, as you describe a problem with you idle which is computer controlled. Could be any number of reasons, ie Throttle Position Sensor(tps), vacuum leak, Egr valve problem, an a numerous other things I could continue to list. If no one in your area has a way to check your car for free, take it to a reputable shop and ask for engine diagnosis with an estimate. Usually they charge a rate for checking the problem and give an estimate, and if you let them repair the vehicle, there is no charge for the diagnosis.
Take your vehicle to your local Auto Zone and have the computer diagnozed for trouble codes - there is no charge. I would venture to guess the Throttle Position Sensor (TPS) is faulty and stuck in the closed throttle position which would cause an over-flow of fuel into the piston cylinders, causing the engine to hesitate and wet the spark plugs with excess fuel. - Good luck.
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judment and problem solving
if it backfires it could be timing or else you have it flooded from trying to start it. You didn't say if the engine is carb or fuel injected. If it is carbed, let it sit for awhile to let the gas drain out of the carb. If it is fuel injected then it is probably timing. year make and model of vehic and millage
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when an electrophile attacks 2nd position in pyridine the +ve charge goes on the electronegative nitrogen atom and destabilizes the intermediate ,in case of 3rd position attack the +ve charge goes on the ring which is more stable than the intermediate formed during the 2nd position attack