Got a tricky engine problem. I think it started when I changed oil at a station where they put in some engine cleaner stuff, to remove burnt oil.
After that the engine sometimes runs bad. It's like it doesn't run on all cylinders.
We made a check at a Cadillac dealer and they told us that there was to high compression in two of the cylinders and then self ignite to early. But that would make the care run bad all the time, wouldn't it? They also checked the gas pump pressure, the ignition etc. And it all checked ok.
As I said, sometimes the engine runs just perfect, sometimes it's like power is missing.

Maybe some of you have some good ideas before I take the top of to have a look. I'm thinking about some value issue or eletrical problem.

Thanks / U