or could be fpr pull the vacumme line off it and sniff. But would get a fuel pressure gauge on it a let us know what you see. 
94 LT1 surging RPM
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94 LT1 surging RPM
The other week I installed a new opti because the car would stal and not start back up. Now my car wants to take a while to start up and when it does it wants to surge. It was fine until today. It's not throwing any codes. Where should I start
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The car threw a service engine code. I pulled the codes with a paper clip and I got code 15 which is the coolant sensor and code 72 which is the speed sensor Would that make the car act like that?
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What about code 72. Where is that sensor is it on the trans tail shaft or behind the dash
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Update hooked up a fuel pressure gauge and got 35 psi with engine running. Pull the vacuum line of the regulator and get 45 psi The FSM says 41-47 psi. Also cleared the code 15 for the coolant sensor and the car rsn smooth with no surges. Getting a new VSS this afternoon for that code. And the speedo does lag behind coming to a stop and accelerating. Not sure if that ties into any of my other issues with the traction control and retarding the timing. And long cranking times to start the car.