As i'm on my way home from work yesterday My 2002 bonneville started idleing rough and pulling away from dead stop is rough with a loss of power also the service engine soon light is on...Does anyone have any ideas ...Please

Get a scan and let us know what codes came up. This will help us find the problem.

Ok so I took it to Auto Zone and they gave me code....P0300, multiple random misfire...
Possible solutions were plugs, wires , coils, injectors, fuel system faults or vacuum leaks..any ideas to narrow it down or where to start...without spending a ton money to fix this problem....I've only had the car for a lilttle over a year and I had it tuned up in february...weather the mechanic was worthy or not is a different story due to the fact that I moved to a different state..Plus I usuall do the work myself...Please help..tx

Check for vac leaks by spraying carb cleaner around the lines. Change in RPM and you found it. Check plug wires and make sure none are touching ground or the O2 sensor wire in back. make sure the are on tight. If nothing, pull plugs and inspect.

I am having the same problems with mine, started to misfire after 2lbs of boost, now it is all the time. I am wanting to check the vaccum lines, do you have a diagram of where they are? I already have changed plugs and wires and checked for the O2 sensor touch, and replaced the ECT sensor. I have noticed leaking around head gaskets, could this maybe a part of the problem. Also, is the gaskets something that I can change myself?

This should cover your vac lines.



As for the LIM gaskets, ya, you can do it yourself but you will need a bit of knowledge. It'* not something I would suggest as a first job. It will also take a good part of the day, but will save a ton of cash in the end. All you need is about $100 in gaskets.

https://www.gmforum.com/t278911/

Most anything you need should be in the tech info section. If it'* not, ask and we will try to get something there.

The person below mentioned head gaskets, and the reply mentioned LIM gaskets. Are these the same thing?

He said around the head gasket. A more likely failure is the LIM gasket.

Have head gaskets been much of a problem in these cars? I've never had a problem with mine.

Come to think of it, I don't recall anyone having a problem with them. At least nothing is coming to mind right now.