Code PO1374 the motor is shaking and throwing misfire when accelerated

Clean MAF and Throttle Body first. Then start looking at electrics. Ideally, you need a high end scan tool to look at the raw data and freeze frame.

scan test for misfire code/s than move spark plug and wire to other cylinders, clear and recheck misfire info, if it moved than replace plugs or wires, if it didnt change, check ignition coil for output, if ok , than check compression, if ok , than check injector circuit with noid light, and measure injector impedence, if ok back pressure test exhaust for plugged cat.

typically caused by a misfire, we need more info like motor/milage/ and check engine lights/ has anything changed/ when did it start

tell me what you done is check engine light on go to auto zone they will put a code reader on it for free tell me what codes come of it dont let them sell you anything ok get back to me i can help you im a mechanic

Check for a misfiring cylinder (does it lack power and shake when take off?). Also check the motor mounts, but this is usually more of a thud when accelerating.

Is the check engine light on? Could be that the engine is misfiring, or broken motor mount causing the truck to shake when you press the gas pedal.

Here's a link to your code P0306. P0306 Cylinder 6 Misfire Detected

looking elsewhere for the problem

change out your distributor cap sometimes if its not pushing the right amount of current to your spark plugs it will cause a misfire it wont throw a code but will make your car vibrate violently. also check your compression and timing

More than likely missing (Misfire) they are prone to engine wiring harness going brittle and causing a misfire