m104 hfm engine want to crap out at over 1/3 throttle
 

Replaced all coils,with bosch,plugs,fuel filter.Behaves like its getting to much gas,nice idle.What next oxygen sensor or maf.Maf was cleaned.Also maybe related,wheres the k38 relay on a s320 1999.

Distributor, rotor, air filter, fuel distributor / EHA, cat converter? Mileage?

Coil are new,and plugs,no cat mileage 185000.No distributor,orfor fuel either..Simply chokes up ,like if I was pumping fuel but no nitrous.Nitrous system is unhooked.no codes

My w124 MAF gave up the ghost in the 130k range, IIRC. I can't say if the symptoms were just like that, but it would get stumbly and threaten to die. I got several different codes from the homemade code reader. If it were me, I would probably start with MAF at that mileage.

thank you I will do so

Do you smell fuel on the fuel regulator. It may be your problem..

Martin

hey Mava new regulator.Now I'm thinking water in fuel.Or fuel pump is weak.I have good power,as long as I don't floor it.I need to fix this before drag racing again in Spring.Thinking of ordering a better pump anyways.Pump has 185,000 miles.
Oh yeah its awful when cold,once it warms I can give more pedal

Yea, the fuel pump would be the logical decision..

I'm getting a computer tonight to check fuel pressure as I put a load on the engine.Its either that or I've gotten water in my tank.I will drain fuel one day this week if I have too.

Yea, I drained the fuel of my S320 which was sitting in the tank for three years after I rebuilt my transmission. i made more of a mess... Ultimately I mixed the fuel with newer fuel, and used it in all the other cars, and lawn mowers...

I'll kill grass with mine