1997 k1500 5.7l po303 misfire on cylider 3 ...

change the ignition coil pack common problem p0303 means cylinder 3 misfire and the coil pack are know to go out on these particular models

code po303 refers to cylinder 3--misfire detected===causes --engine mechanical fault---wiring---ignition/ fuel system---injector---ECT/MAF sensor---ECM. check plug and HT lead to no 3 cylinder. Check that the injector to 3 cylinder is operational and not blocking or squirting. Have a compression test done to check for compression / gasket problems

http://www.obd-codes.com/trouble_codes/

scroll down to your code and open code. gives symptoms and possible fixes

P0303 is misfire number 3 cylinder P0316 is misfire on startup,Go to the number 3 cylinder at idle listen for a vacuum leak like a rupture or disconnected vacuum line more than likely that is your problem you have

VW OBD2 P1300 Misfire Detected, Fuel Level Too LowDID YOU RUN LOW ON GAS OR NEARLY OUT OF GAS? I WOULD CLEAR THE CODE AND SEE IF IT RETURNS, OF COURSE IF IT REALLY DOES HAVE A MISFIRE (WOULD IDLE ROUGH) YOU SHOULD POST THAT INFORMATION.

P0301 - Cylinder 1 Misfire Detected.

Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

Solutions:
- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

Causes:
- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Solutions:
Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

What was the code? PO303
Do you have codes now?

Is the fuel pump coming on?

might be the coil pack is bad, wires, plugs, o2 sensors, dirty injectors, catalic converter ( only if you smell rotten eggs ) . cylinders are misfireing.

break down of the codes is

po303 - that would be a misfire on cylinder 3
uo101 - cant communicate with TCM
uo107 - lost communication with throttle actuator control module