engine skip
 

2000 Buick lesabre 3800 motor started skipping ckeck it with code reader/ multiple Cylinder.misfire check coil packs found one not fireing replaced it new one doing the same think is it the EC1

Could you be a little more specific?
First what code(s) did you get?
When does it misfire, cold, hot , all the time, under load , accelerating, idling?
When were the spark plugs last changed? Did it start after you just bought fuel? All these are important to know to make any kind of worthwhile diagnosis.
Not sure what you mean by EC1.

Its skips all the time its C3I ignition coil/module assembly

That what Haynes repair manual calls it

Did you get any other codes other than the random misfire code?
How many miles are on the odometer ?
When were the spark plugs & wires last changed?
What kind of equipment do you have to work with?
We will need to know what kind of maintenance has been done to the vehicle?
You never answered as to what the code #s were.
Are you planning to do this work yourself or having someone else do it?
There can be many causes for a misfire and more for a random misfire.

Néw ignition module fixed the problem

If you don't mind , how was it determined to be the ICM ?

It was the next in line power source