Anyone know of any good, trustworthy shops or individuals in the chicagoland area to give me a hand diagnosing my 91 Z?

 

Hello, there is Bob's Auto in Bellwood, IL on Mannheim and St. Charles 708-547-8877. I have been a customer since 1991 and they are Napa/ASE Certified. What's wrong with the Z28?

 

Hey CC, thanks for the reply. I recently polished the plenum and runners, put everything back together with new gaskets and torqued to spec and all vaccum lines accounted for. Now it fires up fine, but when the coolant temp hits about 110 or 120, it starts idling rough, gets progressively worse to the point the engine is struggling to idle at all and I have to shut her off. And it's not shooting any codes. I have also replaced the coolant temp sensor and the O2 sensor with no luck. Thanks again!