I need help with my 2000saturn saturn ls 2.2 twin cam it wont start has spark but it is yellowish and has fuel pressure is good but it wont start changed the plugs and crank sensor also changed the collent senor and fuel pressure reg i dont know where to look now

 

Yellow spark indicates bad coils to me. But I don't know if your car has a single coil or if it has multiple coils. I'm not familiar with the DOHC engine at all.

 

Make sure the battery is fully charged, and that the connections to the battery are clean and tight. Has this non-starting problem been sneaking up on you, or is this "all of a sudden" ??

 

Battery is good and this prolem was all of the sudden i was checking the spark plugs
Due to lack of power and it never ran since then and the coils are all in one

 

Is the yellow spark at the plug or directly off the coil wire? If at the plug, then maybe the plugs are not the correct ones for your car, but highly doubtful. If grounding a coil wire shows the yellow spark, I'd try replacing it and see what happens.