1995 toyota T100 misfires at 3000 rpms , changed fuel filter ,cleaned fuel tank changed fuel filter, plugs, throttle position sensor, ckecked timing , camshaft sensor, cleaned mass airflo sensor, cleaner intake, put in SEA Foam, and injector cleaners, what else could it be ?
Check ignition igniter and double check on the mass air flow sensor. This is more of a timing advance problem. Also, please check any vacuum leaks on the emission parts e.g. egr valve. Make sure that there is no vacuum leaks somewhere in the intake manifold and other vacuum hoses.