97 blazer no start on first try

97 s-10 blazer 85,000 no start on first key turn starts right away on second key turn no codes set has stalled twice since condition started runs great after start thinking could be fuel filter, fuel pump, fuel pump relay, egr valve?? any thoughts?? had trans valve body rebuilt 2000 miles ago gas milage increased 3-4 mpg with rebuild getting 21.7 on highway thanks in advance berniescout This morning i turned the key to run for a few seconds before trying to start it started right up no problem also when it stalls it is only at idle thanks again berniescout