1994 Chevy Blazer hard to start after sitting for several h

my 94 s10 blazer 4.3L is hard to start first thing in the morning or if it sits 8 to 10 hours or so.. i can flip the dey of and on 3 or 4 times and pump the gas pedal once and it will fire right up.. it was running sluggish so i put some injector cleaner and it runs much better but still hard to start .. pls help me .. thanks