1999 chevy blazer not running well?

Question

1999 chevy blazer not running well?
it spits , sputters only works when the temp gauge on the dash is at 210, when the gage starts to go up and down the car acts up i have changed o2 sensor fuel pump and filter eag sensor eic sensor temp coolant sensor sometimes start and runs other times hard start have to pump on gas to keep going. has been on a computer says preety much nothing wrong mass air flow is low and sometimes it says temp collant circuit high imput any ideas will help or maybea you had the same problem and know what to do HELP IF YOU CAN

Answer 1

The coolant temperature is normal for the 4.3 - 262 cu. in. V6 motor. I'd try an inexpensive thing first. Add a 16 oz. plastic bottle of 3M Fuel System Cleaner and a 12 ox bottle of isopropal alcohol (dry gas) to your fuel tank.
If that doesn't correct the problem I'd suspect something is amiss with the EGR valve (sticking open) and or the coolant temperature sending unit that allows vacuum to reach the EGR valve. If the motor runs at all the electronic ignition must be OK.

Answer 2

almost sounds as though your catalitic converter is going bad causing the exhaust to clog. I have 2 blazers, 91', and a 99'. have never experienced that particular problem. Here in Ft.Wayne Indiana, we manufacture the 4.3 manifold. To my knowledge, the 99' manifolds do not have the EGR, so I dissagree with some of the information supplied by another answer.

Answer 3

Bad mass air flow sensor

Answer 4

if you pull number one plug wire off it will start if you put it on it will not start it a new one on me