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I have a '71 Spica 1750 engine. Engine runs great. Starts up easy cold, plugs are the perfect color, etc...Pump is aging, not rebuilt by Wes.

Only problem is that when returning to idle from a high RPM, the engine stumbles as it hits idle RPM. It is so bad that the engine almost stalls. It never does stall, however, and seems to always return to a satisfactory idle. It is still drivable. If you blip the throttle to, say, 2500rpm, let it return, and then blip the throttle at idle again quickly, the engine will cough, stumble, slightly backfire.

I would like to think that perhaps this is a problem with the FCS. If I understand the system, it sounds like the FCS could be sticking. Is this correct? Any real solution that I can do at home for this?
 

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1984 GTV6, 1973 Berlina, 1987 Milano
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1,568 Posts
Do you have the SPICA manual? There is a test for the microswitch.

What Idle speed does it have?

Sent from my GM1917 using Tapatalk
 
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