Get a service manual and therein you should find numerous diagnostic tests to perform. Problems with ignition and/or fuel systems cause the ECM to “adjust” other functions such air/fuel mixture or timing when a sensor detects too much air such as a vacuum leak. Without diagnosing properly you can end up swapping out parts which is not a learning process. First do a tune-up; spark plugs and cables, distributor cap and rotor, timing, oil and filter change, air filter, fuel filter (I would clean out fuel lines too.). Install a fresh battery (make sure it is less than 3 months old) Pour injector cleanor in the fuel tank. Visually inspect all wiring and connections. The truck should start in two seconds by simply turning the key after you do these things. If it takes 10 seconds to start (hard starting) then you have problems in your sensors or engine or wiring or injection. Sounds like you need a complete clutch job as well, that will be a learning experience for certain!. Also get a vacuum gauge when you get a fuel pressure gauge (it should be a 2 in 1 item), and a good digital voltmeter as well as a strobe timing light. Always buy good tools. Always!