tommobiletech
you can check the plugs and see if they have wide gaps from the electrodes burning , the normal plug gap for the spark plugs should be set to about 0.8 to 0.9mm or 0.035 in.
And do not use any other spark plug other than ngk or nippondenzo plugs, they will not work.
If replacing the spark plugs does not fix the problem then you are still looking at a bad cam sensor or cam sensor wiring problem, once again do not get the aftermarket sensor, use OEM only.
I have had too many problems with the aftermarket parts for this engine not working or lasting.
cat part number for spark plugs is: 91H2002860
cat part number for the cam sensor: 91H2001170
these part numbers may have changed since this manual publication but when the cat parts rep looks up the number it should change to the most recent updated number.

As for wiring up the seat sensor and seatbelt circuit to a 2 wire seat? There is a common wire #996(black), the seatswitch wire #610 (Lavender/Yellow) and seatbelt wire #609 (green/white). The common wire is in center of the plug. If the seatbelt does not have a wired circuit i would recommend replacing the one on it with a wired in one.

good luck