P1300 Toyota - REPLACED IGNITION COIL BUT STILL HAVE SAME PROBLEM

Question

replaced ignition coil for #1 cylinder, cleared check engine light. Truck ran for about a month but code popped back up.

Answer 1

there are 3 ignitions coils, 1 per 2 cylinder did you replace all three of them? if not the other two ignition coils could be bad.

see test below 

also a bad spark can cause this issue.