I have an 84? C10 with 90K and a 5.0. when I start the engine in the morning or anytime it sits for more than 4 hours or so i have trouble getting the engine started. It turns over at first but even if i give it gas there is no response. I usually have to try twice more before it roars to life with a big puff of white/blue smoke. i think my valve seals are going (because of the smoke) and i?m getting some oil in the cylinder but i was wondering if this would affect its ability to start. once i get it running it runs really well and i only have trouble starting once the engine has cooled down to ambient temperature. any thoughts?