I have a similar problem on my 1987 190E 2.3, with only 28,000 miles. Car sat for several years while my wife was ill, and has been a problem ever since. Spent about $1,200 to have the dealer drain the rotten gas and replace lots of parts/filters, etc. Earlier this year the head gasket blew, and paid the dealer $3,100 for that repair, just to have no acceleration about 2 weeks ago, and the dealer referred me to a muffler shop to get the clogged "Cats" replaced. Did that, and while much better, still have bogging down if I floor the accelerator. Hard to get up to freeway speeds quickly. Now appears the Mass Airflow Sensor may be the culprit. On this model it appears I can replace the Airflow Meter Potentiometer to correct that problem. I have ordered one, and wondering if I should look for some other issue. I have already replaced the fuel pump, check valve, accumulator, and fuel pump filter, and rebuilt the fuel distributor some time ago. I have tried several mechanics to get this car back into good condition, but with each try, it seems something else goes wrong. Will appreciate any advice.
Thanks,
Tom Bell
[email protected]