Put your timing light on it, and watch the ignition while this happens. If the sparks are good and at the right time, you've eliminated this section as being the problem.

That leaves the fuel circuit. Almost always it's low fuel pressure, but these engines have a lousy wiring harness section for the injectors. A listen to the ticking of the injectors will tell you a lot.

'97 T-100 SR5
'86 Toyota's, the variety pack (all gone)