[Robert1492]

I would say Spark Plug Wires; this was the fix for me.

My truck was throwing codes for miss fires on all cylinders speratically; I ended up limping home a few times.

My Indy advised me 80% of the time its the wires on these things; he was correct in my case, replaced wires and all is well for over 1 year now. The plugs should last 100k miles easy on these things and from what I know rarely are the cause.

This was the only issue I ever had with my truck, minus the recalls. I just turned 70k miles this morning.

I ended up escaping this one for 450 bucks.

 

[Robert1492]

My truck had exactly 60k also when I ran into the same issue you describe.

I would replace all spark plug wires; especially if you can get it done in the $400 range.

I was lucky too have a very knowledgable Merc Mech with tons of W163 exp... I think your having the same wire issue that hits many W163's.

Too fully service your engine can get very pricey, it very well could be a Coil Pack but I'm leaning towards the wires, hope you get this resolved soon and update us as too the final fix.

I have $50 on the wires

 

[Robert1492]

I'm not kidding when I say exactly what you are describing was my issue. I was able too drive my car for weeks before I got it fixed. My car would miss fire and go into limp mode but only when I would hammer down the peddle and hit say 4k RPM's. I would then pull over, let it sit for a few and restart: everything would be fine until it happened again.

My wires did not cause a constant issue, but I'm sure they would have in due time.

Either way, you never want too just dump it in the shop, get the codes, clear em and drive around until it throws more codes too verify the possible issue.

I still have my dough on the wires. I hope you have a trusted Indy. I miss my Volvo C70 in times like this, what an easy car too DIY service that was.