I have an 02 camaro that just recently started having probems starting.. it starts up fine sometimes but other times its like i have to choke it to start up. i would have to hold the key for like 5 sec then it would start.. i just recently changed the fuel pump and had the fuel injectors serviced at pep boys.. what else can it be..

 

Check you pressure. You might not be holding pressure at start up. I have read a lot of thread from people having problems after a replacement. The fpr could also be bad.