Fuel injectors

I have a 1992 Honda Accord EX with approximately 142,000 miles on it. It is a 4 cylinder. Frequently, my car starts all the time. Other times it wants to start but doesn't. It sounds like it is ready to start but it doesn't catch the last turn (in a sort of speak) to start all the way. I wait for alittle while and usually, if it is a good day, it will start up after being off for awhile. I have had all kinds of work done to my car so this seems like the next possible thing. Like it isn't getting enough gas. I do put fuel injector cleaner in my gas. But it is still happening.

Please help me.
Thanks