Code 0661
 

For about 2 weeks I've been having some power loss in the top end of my rev range, between 5000 and 9000 rpm. today on the highway I got a sudden loss of power and a blinking CEL. I pulled the codes immediately on my CarPC and I have a P0302 Cylinder 2 Misfire and a P0661 Intake Manifold Tuning Valve Control Circuit Low Bank 1.

I expected to see the Misfire code but I didn't expect to see the second, which after search around appears to be the SSV solenoid.

My question, can the SSV solenoid cause a misfire

The SSV could definitely explain the loss of power at the top end.

As for the misfire, are your ignition components good? Is your fuel pump fine?

New LS2 coils new plugs & wires, fuel pump replacement under recall