1997 GMC Suburban P0301 Misfire After Intake Gasket Replacement - How to Fix Timing and Diagnose Cylinder 1 Issue

I recently replaced the intake gaskets on my 1997 GMC Suburban with a 350 engine. I took great care to document all vacuum lines, clean both upper and lower intake plenums, and torque all gasket connections according to manufacturer specifications. Before removal, I marked the distributor and reinstalled it so that all timing marks aligned properly. After starting the truck, it ran roughly and triggered a persistent P0301 diagnostic error (cylinder 1 misfire). I cleared the code multiple times, but it returned each time. I’ve reviewed several online resources about checking engine timing, particularly focusing on Cam R**ard Offset. However, my borrowed scan tool (Actron CP9180) does not display this parameter, so I cannot confirm if the distributor is properly timed. Additionally, I did not adjust the distributor gear during reassembly. I’ve performed the following checks: - Tested plug wire resistance: Plug 1 shows 1 ohm (good), and swapping it with plug 3 had no effect. - Observed that plug 1 appears dry, not wet. - Measured fuel pressure — it reads normal initially but drops to zero after a few minutes. Key questions: 1) Does P0301 specifically point to cylinder 1 only, or could it be a broader misfire? 2) With a dry plug and dropping fuel pressure, is this indicative of a sticking injector? There’s no black smoke observed. 3) Could the P0301 error be caused by improper cam r**ard offset timing? 4) Is running lean dangerous for long-term operation? I’m considering letting it warm up to check O2 sensor readings to determine if the mixture is lean or rich. 5) What should my next diagnostic steps be? I suspect that even a small timing error could interfere with misfire detection, especially after intake work. Given that many DIYers overlook cam timing during gasket replacements, I believe this may be a common but overlooked issue on 1997 GMC Suburans.