Hi I have built my dream Camaro 91 convertible Rs added subframe connectors ,installed 86 Vette L98 with some mods mild porting to heads air plenun clean up etc Bosch injectors, Xtreme energy 262 cam,Accel coil wires, 5 speed built up. Mid length headers 3' exhaust to magnaflow dual 2 1/2 pipes 3:23 posi rear end was suppose to be 3:42 vendor sent wrong part but made the price right . It seems a little lopey at highway speeds. No matter if at 1600 rpms or 1900 rpms only at light loads. Under accelleration it is awesome car very fast. The cam is Xtreme Energy 262H Hydraulic Flat Tappet Camshaft
Lift: .462''/.469''
Duration: 262°/270°
RPM Range: 1300-5600 So I don't think the cam itself is causing it. I adjusted tps, could something else be causing this. Any imput would sure be appreciated thanks Mike

 

probably need some tuning for the cam and the injectors (my guess is Bosch III type injectors).