HOW DO I BYPASS SPARK SYSTEM ON 1995 GMC SIERRA

I don't know your problems say like that But I can tell you what to do to check it for good.
first remove spark plug on cylinder 1 place piston on end of compression timing mark to 0. Now you should have the rotor point to number one cylinder. Find wich way the rotor turn and do firing order 1-8-4-3-6-5-7-2 that's it

What have you checked so far ?
Is the coil getting power and a ground signal ?

run the fault codes
could be a problem crank/cam position sensor or bag ground wire connections

plastic distributor ? wrong screws in rotor? timing?

i have a 1995 gmc truck backup lights not working

truck has a pass- key anti-theft system you will have to take the VIN # to GM and have them make you a key you can not hot wire or bypass the system, the truck will nut run with out the key....sorry

installed new heater core and new themostat in my 1995 GMC Sierra truck and it still blows cold air. What is the problem?

u most likely have a worn clutch or air in the system from a hydraulic leak this has no adjustment .

Check your fuel regulator and replace the injectors.

NO , just replace the the gasket and exhaust bolt, just make sure you buy a stainless bolt, there not much more but they will out last the truck. and might as well replace the drive's side too since your working on it. Good luck and hope this helps.