Last week I had the timing on my 94 turned up to 16 degrees, I also put in 191 dv's. The truck ran fine after the install. Now after the truck sits overnight without the block heater on it will not start. I know my intake heater is working and I have brand new batteries and starter. The truck cranks over fine but doesnt want to fire. After leaving the block heater on for a few hours it will start right up. Im thinking that possibly the timing might be too high? And this is causing the hard start. And maybe there is a little residual air in the fuel lines from putting in the delivery valves. Any ideas on how to fix this would be great.