I've got an 84 Grand National, converted to 87 ECU and using an LT-1 MAF with Translator.
For a few years now I have had an odd problem that shows itself in cold weather. When the outside temp gets below 55 degrees, I get an engine miss when the engine is under load.
The car will idle fine, but when you give it throttle before it is fully warmed up, the engine cuts out randomly for a second or two. This is not like a misfire on just one or two cylinders. Its more like a complete loss of power. After the car is fully warm, then the problem mostly goes away. There is no backfire. Just loss of power.
Since the problem began I've changed the fuel pump and ECU for other reasons, and the problem is still there. Fuel pressure is good. Also, just checked the throttle position sensor with a multi-meter and it is working fine. Voltage increases smoothly without interruption as the throttle is moved up to about 4 volts.
Anyone got ideas on where the problem might be? What troubleshooting I could try, or what to replace?
Thanks
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