I have a 95 silverado with a 305 tbi with 189,500 miles on it. I've recently replaced plugs, wires, cap, rotor, fuel filter, and the injector peice right above the injectors on the top of the throttle body. Once she gets warm, she starts to spit and sputer and decides to cut out half the time. I'm thinking a sensor is shot but wondering which one it could be? I'm thinkin map sensor or o2 sensor. Any ideas?

 

Does this happen only randomly or is it constant once warmed up?

 

Pretty much garunteed after about 5-10 minutes of ideling, otherwise when it quits doin it goin down the road, she still flys...

 

First thing you might check is the fuel system ... the fuel pump and regulator for correct pressure.

Injector may be partially plugged causing a stream instead of a mist ... clean injector might help.

Check and clean the engine grounds.

There may be a leaking canister purge solenoid.

Change the PCV valve.

There may be a lean mixture from a vacum leak at the intake manifold. Sometimes if you remove the PCV valve and add a little propane inside the valve cover .... if the engine smooths out then suspect an intake gasket leak.

Check the signal output of the throttle position sensor and the engine coolant temperature sensor.

Check the EGR system.