Chevrolet Repair: 95 s-10 misfire, intake manifold gasket, oxygen sensors

Question
hello I have a 1995 chevrolet s10 with the central port injection vortec engine.  I have been having problems for months and cannot figure out the problem.   The truck runs fine when I first start it up but then once it starts to warm up it misses, spits, spudders, and even sometimes stalls.  If I keep my RPM's up it doesn't do it until an uphill acceleration.    So far I have changed the EGR Valve, TPS Sensor, Map Sensor, Oxygen Sensors, Spark Plugs, Wires, Dis. Cap, Rotor Button, Coil, Fuel Pump, Fuel Filter. Although there is a terrible misfire, the truck does not give a code.  The truck is OBDII. Please help me!

Answer
Hi Jesse, The only thing I can think of is the CPI injector is bad and not spraying fuel into the cylinders the correct way. Your intake manifold gasket might be bad to I have seen these cause a rough idle. If your doing one might as well do the other, so do them both.

Hope this helps

Have a Nice Day                Mark