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depends on the year and model. for example, on my 97 Grand Cherokee Laredo 4.0L , the cam sensor ( also called pick up relay or coil ) is underneath the distributor cap and rotor. flat, round, plastic device with a magnet and little wire (2) with plastic connector. the crank sensor is on the top left ( driver side ) , backside of the bell housing of the transmission. easy to find if looking up at transmission from underneath jeep. wire harness runs by it. will need a couple of long handled extension bars to remove bolt holding it in. do not forget to put little gold bracket back on with new part. this acts as a spacer as well as for support. you can look up more specific info for your vehicle on e-how.com. just type in for example : signs of a bad cam sensor on what year vehicle, how to change the part on vehicle etc.
Check all the vacuum hoses on the intake manifold for a leak. Replace all broken and cracked lines. Check from the coil to spark plug wires with an inline spark tester for fire. Check the spark plugs for fouling and cracked terminals. Inspect the spark plug wires for worn or cracks. If you can check the fuel pressure to the throttle body. Also look at the air filter. Hope this will help you.
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