SOURCE: while in park 1988 mercedez benz 190e idles rough and sometimes
This is an interesting part, and I spent quite some time to fix the problem. I list it here those steps in the order could fix the problem ranging from least expensive to most expensive steps. It just happened to me the last one really eliminated the problem. 1- Make sure it gets turned up first. 2- Adjust cables to increase idle. There are two cables. You remove the air filter to see them clearly. a- one for the gas, the other for transmission. b- clean the area well so you can see a micro switch. This switch called cut off switch. c- whatever adjustment you make, the level of the switch has to press on the switch to maintain the idle. If you see it off, you can bend the metal part to keep it in place 3- Take off the Fuel distributor to clean the throttle below it. 4- Replace all the injectors. These are not Electronic Fuel Injectors so you don't have to deal with Injector module. 5- Replace the fuel distributors. Good luck.
SOURCE: I have a 1988 Buick Century Custom with the 3.8
Check the wires for a good connection at the cap and plug, check the rotor and cap for condition and also look for a loose or broken vacuum line.
SOURCE: 1988 buick reatta runs rough for awhile lacks power and dies
Check for Vacuum Leaks. Just found one yesterday on my 88. spray carb cleaner around engine bay while running and listen for whistling sounds. if rpm goes up vacuum leak in area you sprayed get a strong light and look for cracks breaks or holes. hope this helps!
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