ok i new to this sight and new to my 91 camaro.been trying to figger out exactly what kind i have. from ever were iv looked and on this sight there were no i-roc z28 made in 91 except the convertables..it has a 5.7 tpi.no powere windows or doorlocks..but does have ac..no t tops.ect...crazzy thing is on my dash it has an emblem of Z28 I-ROCK..some one was telling me it is fake but from the way it looks it does not look fake..but any ways..when i first boaght the car it ran great except the fack when u stopped at a read light it would die..i had the intanke manifoled gaskit replased..after that car ran great with no problems..but two weeks later..now i have a starting problem..and from what iv seen on the forms.this guy said it was his fuel injectors..so really not sheer..the only code that pops up is a 99..also now my car back fires. but this is what dont make sence..to me its an exost leak..most likelly..but when im exceleratin it dont back fire. it only does it when i slow down..like when i take my foot off the gas in 4th gear at 45 to 55 miles an hour.but if i push in the cluch it dont back fire..so now hears one more thing..when i start the car its a hit or miss..some times it takes a copel crakes and it will start..or some times it starts fine..but when it takes a copel cranks.when it starts i get whight smoke out of my exost..car starts to idel like crap..then it go to idel fine and smoke goes away..sorry i need some help..fustrating..and need help figering this stuff out..so if there is any one out there that has delt with theez problems hit me up and tell me if im on the right track..thank you