[RONAREY]

Have 1986 chev s-10 pkup. 2.5l 4-cyl, fuel inj 5-speed manual. When I start with engine cold (surrounding temp, any weather or season) there's a solid, dead miss. The further I drive the miss starts to gradually go away. Eventually about a mile, miss is gone. Doesn't return until engine is off, cools down. Never overheats, has gotten worse last several months, taking further to go away. Suggestions? Thanks. Ron

[TxGreaseMonkey]

Consider replacing the Engine Coolant Temperature (ECT) Sensor, which affects fuel injector pulse width. The ECT Sensor is a temperature dependent resistor (thermistor), whose resistance decreases as the engine coolant temperature increases. It provides a richer mixture when cold, leaner mixture when hot. They become corroded, due to not changing the coolant frequently enough, flood the engine, and waste a tremendous amount of fuel.

Due to the age of the truck, I would also replace the Ignition Control Module (ICM) and coil:

http://www.autozone.com/autozone/cat...hText=ignition

I recommend doing this every 120,000 miles or 10 years, whichever comes first. ICMs are problematic components on your truck.