The '93 FSM post at the top of the forum will work for you for how to check the resitance of the injector, the #'s are for later injectors, though 4Crawler should/might have the right resitance #'s for you. It also shows you how to check them in the engine, and how to check their pumping capacity out of the engine. Testing Injector

More than tread lightly. Leave it like you were never there, nor anyone else.
'90 X-cab 4.88's 33 BFG AT's, rr ARB, Headers, Ignition upgrade, cold air induction.
'91 X-cab 5.29's 315's BFG MT's, rr ARB, custom bumper and flatbed