I have a problem. When I try to turn the key on my 89 240 dl wagon sometimes the battery will be dead. This will happen when I least want it to and makes my car very undependable. It happens at least once every ten or fifteen times I drive it. I have checked all the key components including the belts, bushings, voltage reg., alternator, battery, etc. Someone told me it might be a bad relay (fuel injection relay?). Someone also said the starter's solenoid might be pulling power from the battery. I have had this problem for a long time and would like to beat it. Any suggestions or tips would be greatly appreciated.

Also when I try to start the car it always chugs and I have to hold the gas for a few seconds to get it to stay running and then it is fine. Is this just the cold start injector? It happens in the summertime too. I have cleaned out the throttle body and the AMM is good.

Thanks for any help. Steven