Car wouldn't shut down when accelerating hard...

[wifehatesit]

Had a scary thing happen the other day, just got done changing a blown head gasket, and torque converter. I put the motor in, buttoned it all up and took it for a blast... when I mashed the throttle, it continued accelerating (or at least pulling hard) after I let off the gas. It all happened so fast I couldnt diagnose whether the gas pedal was stuck down or not.

Normal, I'd think binding linkage or serious vacuum leak.. but the car is a race car, and and there's not much in the way of vacuum hoses.. I did snug down the carburetor a bit more just to be safe. The thing that tells me its probably not a vacuum leak is the car idles perfect, and doesn't hunt at all. I just replaced the base plate on my carb with a Pro-form aluminum baseplate because my stock holley base plate had a cracked bolt-down ear. I'm wondering if the baseplate bound up...

At idle, the rpms drop quickly with no hang up or delay at all... this is another reason I don't think its a vacuum leak..
I'm going to buy a new throttle return spring to be safe...

any other ideas?

 

[BigHairyMonkey]

your throttle cable could be binding up, or your pedal is physically getting stuck on something, carpet, etc

 

[jrichker]

Try playing with the throttle with the engine not running. Have a helper press the accelerator pedal while you watch the throttle butterflies and linkage.