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4.3 TBI (throttle body injector) You dont have a TBI you should be equipt with a CSFI people in the field call this the spider injector,they inject fuel into tubes for each cylinder , as for the fuel pressure it should be 54 psi to 60 psi,and this is for a 4.3, The CSFI system does plug up which causes rough idle due to the poppet valve or seat,to stick open or closed,Ive ran fuel injector cleaner that has been sucesfull maybe you can try that
No carb. It more than likely has port injection, which is an injector for each cylinder. The older ones, (after carbs) had throttle body injection, that looked like a carburator, but had one or two injectors.
any body parts from 1988-1998 will interchange.(except box parts stepside vs fleetside Grilles and head light/front signal lights differ from year to year but an newer grille can be put on an older truck as long as both trucks have the same headlights) As for the complete engine you can use any throttle body engine from another truck But you are best to keep the computer or at least the chip with the corresponding engine. the computer can be found behind the glove box. I believe the ones that will work with your 94 are 1988-1995 Hope this helps!