My 1993 K5 Blazer has no power once I put it in gear. It starts runs smoothly at idle and when revved up in neutral. Sounds perfect but when I put it into gear, It stutters and I have no power. I’ve replaced rotor, cap, plugs, coil, and fuel filter with no change. Injectors throw a nice spray. Any suggestions appreciated…

 

Check your fuel pressure, pump may be failing and can't keep up under load