New guy needs help!!! P0302 misfire Options

[freeriders98]

So I just picked up a 96 GT. Guy I got it from said it had a rough idle and check engine light would come on occasionally. Had a rough idle, but CEL was off when I test drove it. Of course it showed up the next morning...

So here is what I know now. CEL is throwing a P0302 code. It only happens if I let it idle for a bit, like warming it up on a cold morning. Before I drove it home after buying it (4hr drive) I cleared the light it and it never came on.

At idle it is rough, but as soon as it comes about 1000rpm it smooths right out and runs really nice.

I checked the plugs today, all looked good. It has midgrade NGK's in it.

I've been looking for some pointers for a couple days now, and have searched on here.

Most reference a coil/plug set-up. So does my Celica have just a standard single ignition coil mounted on the fire wall?

How likely is it that plug wires are my issue? The ones on it are tiny and look to be a generic set. Would a set of better insulated NGK wires help? I know that wires can get interference and cause some firing issues if not well enough insulated.

And help or input would be great. I'd like to at least narrow it down to 1 or 2 things before I start throwing money at it.

[Box]

Yep, RockAuto is where I buy my parts some 95% of the time. Sometimes when buying only one part the shipping will be silly and it's better to buy off eBay or Amazon. Whatever they use for determining shipping is really weird at times, as sometimes a more expensive part will end up less because of shipping. I guess it all has to do with which warehouse it's coming from. Anyway, I and my family constantly do business with them and they're the best. If you ever have an issue they generally resolve it within 24 hours. One time they forgot one of my parts, so I got on the site and let them know and they shipped it for no cost with no questions asked. Most other places they'd have you jumping through hoops and tearing your hair out.

Anyhow, ditto on doubting it's a compression issue. If it were a carbureted vehicle I'd point at A/F mixture, but being fuel injected that shouldn't be an issue.

This post has been edited by Box: Dec 26, 2014 - 5:03 PM