[ghost89gt]

Ok i just installed a E-303 cam in my 89 gt stock motor. Automatic trans. I also installed a set of BBK Eq length headers one of the cheap intakes (like RPM manifold). I need to find a good vacum diagram. i am getting a 44 and 94 engine code, which comes up as check vacum lines. Does any one know why after warm up setting at a light my rpm goes up and down like around 600 -1200 up and down up and down. It has 19 lb injectors should i install 24lb? Also i installed a performance automatic valve body it is the street strip one. it has a stock torque converter should i go with a higher stall will that help. Sounds good just having trouble when i am at a light.

[mrbob909]

I've got a similar setup as you, and i've had a bit of surging too, not up to 1200 rpm tho. It sounds like youve got a vacuum leak, mine would usually try to idle at 600 rpms, and if i put it into gear it would die. A tune would fix this for you, assuming your vacuum lines are all correct