Your information is far too vague to even start to diagnose why it runs poorly. But if its been rebuilt check obvious things like timing, spark plugs, wires, distributor, basically all ignition parts. If you don't find anything there you've got fuel delivery to look at, maybe check the compression, do the valves need adjusting, vacuum leaks, cracked intake manifold, and the list goes on. It would really help to know what the vehicle is, what engine, year, etc so we know if it's injected, carbed, hydraulic or mechanical valves, what kind of ignition, etc. Good Luck!
SOURCE: topkick cat 3116 wont start
Check your fusible links; these are small wires molded into the middle of a bigger wire they are usually located up by the battery cables. When they burn they become discolored and softly flexible. Also check your relays too.
SOURCE: 1997 Chevy K1500 Z71 Chevy fuel injector problem
Did you check fuel pressure to make sure you are getting proper fuel pressure? If it will start with starting fluid then it has to be either fuel related or electrical. Are you getting power to your fuel relay? When you turn the key on can you hear your fuel pump come on? I would not use anymore starting fluid at all to try and start it other wise you cause major problems.
SOURCE: no fire to plugs
I supose that you are getting a spark at the spark plugs when the engine is cold or no.???
Have you checked the distributor cap and spark wires?
Finally do you mean to say that you have changed the ignition module ? that's that black/grey rectangular like unit that held down by two screws.
SOURCE: when you replace thermostat where does the gasket
It should be a rubber ring that actualy stretches& goes around outside edge of thermostat.
Testimonial: "thank you just wanted to make sure"
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