I've been having numerous problems with my car as of lately. I own a 1991 560Sec. Just over 151,000. For awhile now, I've been having trouble getting the car to start. Replaced the cold start valve, fuel filter, spark plugs, distributor cap & rotor. Trying to get this SOB to start up every time. As soon as I replaced the spark plugs, engine started shaking and lost lots of power/acceleration. Doesn't seem like it's firing on all cylinders anymore. If I floor it, revs up real high, slow acceleration and then will slam into the next gear. I had been using starter fluid for awhile to just get it started, but I would have to rev up the engine for a couple mins before putting it in drive, just to make sure it wouldn't stall out on me. If the car was driven within the previous 1-2 hours, it would start up. Which is why I originally replaced the cold start. Not seeing any change though. Just this week I replaced the distributor cap & rotor and now it won't start AT ALL! Tried looking for an arc between a spark plug and the engine, but didn't see one. Anyway, if someone could help me with these problems I'm having that would be great. Thanks

 

its quite clear that you got ignition problem. have it check by technician.

 

Ended up being a couple burned out fuses. Now it seems to be running good again. Thanks though
$82 fix in case anyone was wondering.