If a lifter is stuck in the lifter bore and won't move, it has probably ruined the cam. The procedure would be to install a new cam and lifters.
You can't fix a bad lifter, replace the bad lifter with a new one.
The answer is a Pineapple!
take it to get fix
I would replace the ignition control module that's in the distributor.
It could be your off a tooth with your distributor
Change engine oil and substitute one of the quarts of oil with one quart of automatic transmission fluid. Run engine for 1000 miles. Change engine oil again with all oil.
Replace the seat belt.
You have to take the door apart
If a lifter is worn out you are not going to fix it, you will want to replace it with a new one.
The most common problem for a stuck horn is actually a stuck horn relay. Remove the relay and the horn should stop blowing. the relay may be hot from being stuck. replacing the relay should fix the problem.
sounds like a bad lifter, let the dealer fix it as it's under warranty.
A stuck lifter is one that is gummed up with sludge. It is hydraulic and pumps oil. If it is sludged up, then it can't do what it is designed to do. Thus causing a tapping noise. Loud knock are either a rod, rod bearing, knock sensor, rocker arm, valvel spring, timing belt, or possibly just the belt tensioner. If it is a stuck lifter, the cheapest fix would be to run some engine flush in the engine, drain the oil and refill with good oil. If that works it was a stuck lifter. If not, Check with the most accessible first, pull the valve covers and check the rockers and valves. You may need to remove the intake first to access them. If it broke you will see it usually. If nothing is broke then go to the timing belt. Hope this helps.