Where are the spark plugs 04 proton waja 1.6

It certainly could be, but I wouldn't jump to that conclusion so quickly. Leave such diagnosis' to the pros, who often zero in on the most expensive component without proper troubleshooting.

Typically, troubleshooting would start with seeing if you can get a spark at the spark plug. Then work back from that (assuming the starter is turning the engine over properly). This means spark plug, leads, disributor cap, distributor rotor, electrical continuity to the distributor and coil. About the last thing on the list is the (expensive) ECU.

Get it scanned. A proper scanner would show what is wrong. A few probable causes, namely speed sensors, AT position switch, wire harness and eventually TCM.

It must be from the rough idling. Check the spark plug gaps and the lead wires if they have good continuity. Check your car manual for the proper gap for the spark plugs. Set it with the use of a spark plug gauge.

test the ignition coil see the instruction attached AND fix it.
God bless you

If it's 4 cylinders, it's 1-3-4-2. for Mitsubishi/Proton engines.

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Sounds like your Timing Chain or Belt Are Damaged and Caused your Ignition Timing to Jump out of Time, Also check your Distributor Cap and rotor NOTE: if you have a Distributor ,Some are Distributorless. Pull your Spark Plugs out BEFORE you Do Locate #1 Plug its in Front of your Engine.And Trace the Wire to the Distributor Cap. If you have a 4 Cylinder #1 is in the First Plug in front of vehicle, if its a V-6 #1 Plug is on Left side first plug in Front. Depending on which engine you have will determine if your wires go into the Distributor cap Clockwise or Counter Clockwise. So BEST to Simply Mark them to get them back in same order.You'll need to Get the Enging to crank over and have a Buddy Put a Compression Gauge in #1 Cylinder and Bring it up to TDC (Top Dead Center) thats when the piston is up and gets the Gauge to Move up then your on the Compression Stroke, Then check distributor rotor to see if its pointed to where your #1 Spark Plug wire came off or at least close to it.Just hit the Ignition Switch off and on Until you have it showing compression on Gauge. JUST ON and OFF that Fast. If the Rotor is pointing To a different Spark Plug Wire in the Cap, Sounds like timing Jumped. Hope this will help you solve your problem or at least find it. If you don't have or not sure on How to do this i recommend you have a Qualified Mechanic Shop run the Tests. Thanks and Good Luck

it is possible the points in the distributer cap have failed, or worn. check your spark plugs (you will need 2 people for this) or even just your leads by having one person turn the engine over and the other holding 1 lead (just take one off at a time) against the engine block it should throw a spark and arc to the block ******DONT TOUCH THE SPARK IT HURTS****** if you dont get a spark then it is most likly a distributer problem. Hope thes helps

Dear sir, if you change the ecu, u need to reset the combra cable, this seting only can done by proton service center, because it combra cable got the coding inside you need to reset it. anything email to me at [email protected] by.. joseph

REMOVAL OF THE PLUGS:

Do not attempt any maintenance on spark plug if engine is hot. 
1. Disconnect negative battery terminal. 
2. Carefully remove high-tension leads. 
3. Use compressed air to blow any dirt or debris from around spark plug hole. 
4. Check that spark plug fits squarely in spark plug socket and remove spark plug.

Raise a vehicle and install SST(OK552 131 001) in order to replace cylinder 2, 4, 6 spark plug. 

INSTALLATION:

1. Install spark plug into cylinder head.

Tightening torque : 18~22lb-ft (25~30N·m, 2.5~3.0kg-m)

2. Reconnect high-tension leads. 
3. Reconnect negative battery cable. 

Hope this helps and simple to understand. Good luck