If you put fuel into the intake and it starts and keeps running, replace the engine coolant sensor. If you put fuel into the intake and it starts but stalls it probably is a bad fuel pump or pressure regulator. Do a fuel pressure test. Need to know what model, year and engine you have to help you any more.
IT starts @ the intake manifold & ends on the front axle.
Yes, on the back of the intake manifold. If looking at the engine from the front of the car, the large metal piece connected on the left of the engine is the intake manifold. At the back (towards the firewall) of the intake manifold is the EGR valve. With age, it typically starts looking a rusty red and is held on by two bolts and an electrical plug.
Well you might have a dirty fuel injector, low fuel pressure, or an air leak somewhere in you're intake manifold.
After the exhaust blowdown is nearly complete, the intake slot starts to uncover. At this point an intake pressure boost is needed to increase the pressure at which the air enters the cylinder, to push the remaining exhaust gases and fill the cylinder with combusted air-fuel mixture.
It is located on the passenger side of the engine compartment. There is a black intake hose that starts at the intake manifold(back by the firewall) and runs down to a black box which contains the air filter(up front by the passenger side headlight)
The intake plenum on a V-6 or V-8 is bolted to the top of the intake manifold. It has the throttle body bolted to it. The throttle body houses the throttle plate and is located at the end of the tube that starts at the air filter housing. Sometimes the intake manifold on a 4 cylinder is referred to as a plenum. It works the same way and is found in the same manner. Look for the air filter housing, then follow the hose past the throttle body to the intake or plenum.
Intake air temp. sensor on top of intake manifold near the throttle body. Two wires. Will sometimes throw an engine code, which is removed by disconnecting negative battery cable end for 30 secs or so.
If it runs fairly normal once it starts and you're getting fuel into the crankcase, it's PROBABLY a leaking injector. After the engine is shut off there is still pressure in the fuel line. If the injector leaks, fuel will drip down into the intake manifold. If a cylinder has an open intake valve, the fuel will leak into there and find it's way into the crankcase.
This sounds like a fuel pump issue, an easy way to check this is to spray a flammable liquid in to the intake manifold just in front of the throttle body, if the engine starts for a short time then dies it is not getting fuel. A safer way to do this is to get a fuel pressure gauge and test the fuel pressure. most newer vehicles require at least 55 PSI or more fuel pressure to start
could be wires in ignition system bad or loose, or intake manifold vacuum leaks and in hoses, faulty engine contol system. for vacuum leaks, put oil around intake when running. if there is a leak then oil will suck in to intake.
Sounds like a bad vacuum leak, maybe a bad intake manifold gasket?
That is a common problem with the vortec 350 engines. The intake manifold gasket starts leaking in the corners of it. That is where the water jackets are and it's only about 1/4 of an inch wide and when it starts leaking it allows engine coolant to leak into the lifter gallery and into the oil. Need to replace intake gasket as long as you no it did not freeze and crack the engine block.