Thank you for asking your question on JustAnswer.
If you are sure the spark plug is good and the coil is firing as well as the injector is pulsing, then I would suspect you eaither have a compression issue and or a vacuum leak on the intake at the runner. I would start with running a compression test on that cylinder.
We tried that, but the compression tester we have doesn't fit the hole.
Is there an adapter or something we can buy to make it fit?
So where can I get that from?
Do I ask for a compression kit?
What is in the kit?
I called my brother and he said he got the adapter and ran the compression test today and it appeared to be fine.
So it has to be one of those things?
Spark plug, coil pack, fuel injector, or the compression?