4.9 litre engine firing order

The firing order is on the intake manifold.

Thanks gentlemen!!!!

does that go for a 4.1 deville 1986 too ?

It's also molded onto the manifold. I think it is the same. It said "GM V8 ALL"

It should also be for the 4.1, because that's the classic GM firing order. My dad's Z/28 and Corvette were the same as well.

He guys,

i wanna check my spark plug wire's, i think one is bad (or one spark plug), i know the best way to check is, to run the engine and remove one wire after one (of course put it back before remove another one). My question is, do i have to remove the wire on the spark plug or can i remove it on the spark coil too, it would be a lot easier.

Doesn't matter which end you pull, but be sure you are wearing rubber gloves or standing on a rubber mat or using insulated pliers or something.

Thank you, Ranger.