84 Cadillac Sedan Devill HT 4.1 V8 is stalling.?

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James T

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I have an 84 cadillac sedan deville with a 4.1 V8 HT4100 model. When I got it it was in need of repairs. It originally would not even crank up so we replace the fuel pump with a working and that got it started. We cleaned out the tank and securely installed the pump. Then it would shut off power and found that the alternator was not secured properly, we fixed that and the problem went away .I thought every thing was ok but then it started stalling during deceleration and breaking, it does it a random points. I already replaced the ECM module, but it still does it. When it stalls I lose my breaks and steering also. Sometimes when it stalls it sputters and loses power and then dies. This is baffling. Some of my mechanicaly knowledgable friends suggest a vapor lock, some still think its dirty gas. What options are left with this old tank. Thanks if you can help.
BTW when we changed the fuel pump initially we did check the fuel line and blew air threw them and also made sure the inline fuel filster was clean it was all good.
 
There seems to be dirt still in the fuel system. By chance did you blow out all the fuel lines when you had the tank out? Also, I would change the in line fuel filter.
 
There are a number of things it could be. Even though you cleaned the tank, you could have had some trash in the fuel lines and it could have clogged the fuel filter. It could also be a bad inertia switch and it's cutting out on you. It definitely sounds fuel related though.
 
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