89' k2500 cold start

[izzy101]

???????Truck runs real rough only when starting below 32 degrees(Starts fine otherwise).if you put it in gear when it's happening it won't go faster then 2 mph.once warms up truck runs great. Changed temp sensor, injector sensors, still happening. Anybody seen this before??

[RABarrett]

You might check the fuel pressure. As these pumps age, the delivered pressure drops, causing a lean condition only on heavy demand. The colder the engine, the more fuel is requested by the computer. This causes a lean condition until the demand drops off, as the engine warms. Ray

[izzy101]

Thanks, I'll definitely try that.