94 Vitara surging? timing?

[fixkick]

ok all codes, not 51 are serious.
51 is egr sick, no big deal.
but 24 , never lies. its a hard failure. or is this the body tag code 24 or australia.
VSS Vehicle Speed sensor failure , but i dont think it causes hard bogging like that. only minor loss of power.
but on some FSM the VSS dead is listed as a failsafe (limphome ) activation.
my guess is 2 problems at once, the VSS in the speedometer is dead, is the speedo still working and odometer? one of the 2 must work. or Vss will be dead.

so for now.
vss dead for sure. (seem its not a DTC code but 24 is the market code...) so i put this here from confused. i am.
TPS , suspect
fuel pressure is always suspect in power issues.
MAF, is easy to test. 3 voltage out, keyon, idle , and gunned throttle , voltage out.

on a good ignition system you can spray a fine mist of water on those parts and it will not misfire, the insulation stops this.
(no drowning it in water, just mist)

great the engine is good, no cat to melt
so is just spark and fueling.
if spark parts are all new, then just fueling now. (i recommend those bosch mag wires, for max life and best HV power to the plugs)