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Yellow spark is usually a sign of a faulty coil, but you have two. So if the coils are not the problem, it could be not enough voltage to the coils or something else. The coil fires when the ground connection is removed, in your case the coil fires two cylinders at the same time. I would check battery voltage to the coils thru the module next.
You need a noid light for that but since they are all not firing it's most likely the cam shaft position sensor. That tells the computer the cam shaft position so it knows when to pulse each injector. Let me know if that's it. The cam shaft sensor should be pretty cheap.
A tune up may help, plugs, wires, fuel filter, air filter, if this don't take care of the problem could have a bad coil pack, you can check the coil pack, get some vacuum hose and cut 6 pieces about 3 inches long, put a piece of hose in the plug wire and the other end of hose on the coil, do all 6 wires, do one at a time so you don't get them mixed up, start engine, take a test light hook to ground and touch probe to each piece of vacuum hose, this will short out that cylinder, you should notice engine change, if no change, that coil may not be firing.
start by testing coil for power ,if no power then in the fuse panel you should have anything up too three fuses marked CONT and they should be about 10 amp ,check them
123456 IS THE FIRING ORDER... RIGHT BANK (RIGHT AS IN SITTING IN THE DRIVERS SEAT NOT STANDING IN FRONT OF THE CAR)STARTING AT FRONT IS CYLINDER 1 THEN 3 THEN 5 THEN THE LEFT BANK IS CYLINDER 2,4,6, FRONT TO REAR... THE COILS FROM LEFT TO RIGHT (STANDING IN FRONT OF CAR) ARE 1,4,6,3,2,5 HOPE THIS HELPS
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