1999 buick LeSabre

[boston_seattle99Lesabre]

Hello, I have a 1999 Buick LeSabre with the V-6 3800 Series-2 motor, the problem I am having is the check engine will come on and then blink other time it will just stay on solid or just plan go off, now the real problem is when this happens the car looses power and shutters on up accelerating it smooths out, other times it just run's smooth as silk then up on stopping it would run ruff, loose power. Now I had a mechanic plug it to a machine and he concluded it needed a tune-up so we did a complete one and fixed a few other things to no avail I still have this problem. so can someone help me out here please.

 

[HotZ28]

What were the codes, without somewhere to start, we could only speculate.

 

[whitecrystal1]

A flashing SES light generally means you have a misfire on one or more cyclinders. If the SES light was lit there should be stored codes. You usually can get a free scan of these codes at you local auto parts store. Autozone, Advance Auto...

 

[ViM]

Anyone taking side bets, I'm guessing Plugs, water around the plug hole and leading to new plug wires!

 

[98 TWILIGHT BLUE METALLIC]

I'll guess upper and lower intakes and gaskets.

 

[leftoverture]

I'm guessing he needs a new mechanic.

 

[whitecrystal1]

I'm guessing he needs a new mechanic.

LOL

 

[boston_seattle99Lesabre]

Yes I do Need A new mechanic, And I do not have codes, I will tomorrow then I will post them. Thank you.!!

okay Gentlemen here is the Code that we Got P-0300 Random/Multiple cylinder misfire detected.

 

[mark38]

I second the upper and lower intakes and gaskets.Keep an eye on your coolant

 

[gnhbodyguy]

I'm guessing you got new spark plugs. Did you get new spark plug wires? A good mechanic can test spark plug wires. I was getting cylinder misfires and wires solved it.

 

[boston_seattle99Lesabre]

I bought all new wires, plugs everything you need to do a tune up, pcv valve, filters, now what about the Ignition Coil and the Ignition module.?

 

[ViM]

I bought all new wires, plugs everything you need to do a tune up, pcv valve, filters, now what about the Ignition Coil and the Ignition module.?

Don't buy them yet, those are parts you don't normally throw at a car, your mechanic troubleshoots.

 

[grantlarmstrong]

I certainly would rule out the plug wires.
Sorry.... noticed that you may have already done that.

I had a chaffed wire on my O2 sensor that would ground out causing misfires and never got a code.