Thanks for your help... I have a 1990 toyota truck, won't start, losses power

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won't start, it has taken longer and longer to catch when starting... but turns over just fine... last week It did't start so I checked wires and connections.... un plugged ignition coil and plugged it back in... then it started. it lasted about a week then the same no starting problem again... I did the same thing un plugged coil and plugged it back in, and wire going from coil to distributor, and clean battery cables... then it started after a few tries... then as I was driving about 5 minutes, it lost power so I pulled over and let it sit over night. Next morning, It started , then after 5 minutes or so, lost power going up a small hill. I had it towed, but now I must decide to take it to toyota to diagnose, or to trouble shoot, myself, and start replacing parts, like the coil, on my own one by one. I don't have a lot of tools nor experience,except call support from dad, and a truck manuel and volt meter.