My 1985 Cadillac fleetwood 4.1 rwd will die when you slow down or step on the brake to fast and It struggles to get up to top speed as well. The Engine timing is on the mark and the exaust system is good. I have got the diagnostic codes from the engine and they read -1.8.8 52 -1.8.8 52 -1.8.8 .7.0 if any one knows what I could do that would be great.
The 52 trouble code indicates a long term memory loss of the ECM (for example a replaced battery one day). It doesn't show on third pass (after the third -1.8.8) so it's intermittent and not a problem when you read it out.
I would advise you to clear the trouble codes (by pressing the off and high buttons on your climate controll while in diagnostic mode). To go in diagnostic mode just press off and warmer buttons on the climate controll as you probably also used to read out the diagnostic codes.
If this codes reoccurs there is a problem in the power supply to your ECM which will make it forget the correct settings. Result is it has to find correct settings for idle everytime and you will lack power as it has to find out how much gas can be injected at different RPM's. This happend to me when my battery was dying on me last winter. Replacing the battery (I couldn't start anymore) fixed this problem for me. If your battery is ok I would expect a bad wire somewhere.
Best off luck fixing your problem.
Bad egr valve
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