97 5.7 no start problem Help Please

Hi. this suburban has a 5.7 vortec with 200k on it. It had a hesitation at about 2500 rpm. now it wont start at all. It has a random missfire code P0300. When cranking it acts like it has really advanced timing. Like it runs into a wall and then takes off again into another wall, over and over. I Checked the plugs and they are soaked with gas. Installed new ones and still no start. It has great fire. and the fuel pressure is great as well. Any help is greatly appriciated. Thank you in advance

If you have fuel and spark seems like you are lacking compression.

at your mileage the distributor bearing and the ignition modules fail...

also check that the timing is correct....

If you have fuel and spark seems like you are lacking compression.

I agree. At 370,000 miles my '90 350 TBI would crank and crank but never start. It had popped an intake manifold gasket.