4.3 engine
SOURCE: 2007 gmc sierra 2500 IAT sensor
Well, the IAT (Intake Air Temperature) sensor is located on the air intake duct between the filter and the throttle body (Assuming you have the 6L motor). The wires are easily visible at the plug that connects the sensor to the wiring harness. That's the easiest place to access them.
SOURCE: how to replace a starter on 1994 gmc sierra 1500
unhook the battery, there are 2 wires on the starter solenoid, 1 is a 5/16 nut and the other is a 9/16 nut remove those wires. this maybe easier to remove the heat shield first. next ther are two 9/16 bolts holding the starter in position, remove, and the starter will come out, about a 15min job
SOURCE: como hago para poner a tiempo el motor de gmc
you need to disconnect the wire in the rh floor board of cab and then you can check timing.
SOURCE: My 2003 GMC Sierra Idles Rough And Cut Off
Before replacing the O2 sensors, I would check the fuel pressure. You may also try to have someone pull a trouble code from the powertrain control module to verify why the engine light is on. Do not replace any parts until this is done, otherwise your going to be guessing at the root cause, and it will get expensive with part replacement.
Testimonial: "Trouble code P0101 {Mass Air Flow}and code P0332 Knock Sensor.Thanks i saved a lot money."
SOURCE: I have a 1994 GMC 1500 Sierra with 350 engine 5.7
The timing (base), is 0 degrees before tdc. Keep in mind the timing connector must be unplugged. usually a brown wire with a black tracer, has a single connector, located under glove box, or by distributor. Thanks...
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