Start here: Check for cracks in the coils, to check, start the car and look at the coils to see if its jumping fire anyplace, If so this is the problem, If not, replace the plug wires. This advice is about 90% accurate. May not fix it though. You might also check for loose bolts on the intake manifold or broken (leaking) vacuum lines.
take it to a transmission shop. The problem is in the tcc valve body.
take it to dealership
Yea, the 1993 Buick Lesabre does have a fuse for the horn. However, there could be other reasons why the horn doesn't work, the clockspring or relay could be out.
Water.
I just fixed a similar problem on my 95 LeSabre, got info from this website. http://www.imcool.com/articles/aircondition/fix_vacuum_line.htm
I had the same problem with a 1992 Park Avenue with the 3800 engine. I first replaced the electronic ignition but that did not fix the problem. I then replaced the crankshaft heat sensor. That fixed my problem.
there could be a bad ground for the lights, or there is a short somewhere between your fuse panel and your light
I had this problem with my 1994 Buick LeSabre and it no longer happened when I installed a new battery. It's been at least 6 months now with no recurrence of the problem. Before the new battery, I noticed that if I waited about 5 minutes after turning off the car, I could get the lights to turn off. Seemed like something had to cool down.
Fuel filter or PCV valve? or it could be a weak fuel pump or a bad injector
yes just had this problem the lines were rubbing on the frame causing a wear and a hole. now leaking fuel and smells horrible
Could be a burnt out bulb or a bad flasher unit.
i had an 85 caddy that did the same thing.. It turned out to be a broken wire to the distributer