throw a can of Sea Foam fuel treatment in the gas tank with the new filter

 

Yep....water in the fuel system is going to cause a problem! Only way to get all the water out that I know of is to drain the tank and blow-out the fuel lines. Adding moisture absorber to the fuel will help a little, draining tank best option.

 

I replaced the fuel filter today but did not fix the problem. The fuel system seems to be working properly. I think it is an air issue or faulty wiring/plugs. Does anyone know of any commonly faulty hoses or sensors? I will be checking spark plugs, changing cap and rotor and will get back with the results. The RPM drop is preceded by the temp gauge dropping to 0.

 

I am wondering what people think about this being a possible ECU problem? Since the car drives and runs normally until operating temperature is hit, could it be that the computer is faulty? I just brought my car to Firestone to get tested and they told me I could have a faulty coolant temperature sensor. Would this be worth replacing even though it does not affect the engine or should I try the ECU?

 

Ok guys, just got back in from working on the Blazer all day. I checked for vacuum leaks, MAF sensor voltages, re-seated all connections (easily reachable) and cleaned them. After an extremely long day, I decided I was going to locate the coolant temperature sensor and check it out. After finally locating it, I found that the input harness on the sensor itself had broken off onto the female wire connector. I was stoked to finally see something wrong with a system that is closely related to the problems and symptoms I've been having. I just removed the old temp sensor and am looking forward to replacing it in the morning. Because the 2 prong connector was semi-exposed ( I could see fresh metal of the prongs, looking down) I believe this is causing my intermittent temp gauge drop offs and coincidental RPM drops due to the mixture/ECM information relay being incorrect or inconsistent due to connection problems!

Here is what the plug looked like when I pulled it off of the temp sensor. Notice that the housing of the sensor is on the plug.

Here, I took the broken housing off of the plug:

Lastly, the broken temp sensor with the housing piece the plug had on it.

 

All Right!!...hope this cures the problem.

 

Thanks man! Will give an update once I put it in after work!

 

After replacing the coolant temp sensor and making a solid connection, the car has been running smoothly. This case is closed!

 

Another GOOD to read...."Problem solved.".....YES!

 

Thanks Lanny, feeling good about the fix and hopefully people find this thread useful in the future when running into similar issues.