Now maybe 7 years ago, my car was having a problem going up hills. To make a long story short, I found out that it was because I needed to do a Liqui Molly diesel purge on it.

Now maybe 2 years ago (5 years later), my car was having problems going up hills, I did a diesel purge on it, and the car ran fine again.

Now the car is having problems going up hills again, but it's only been 2 years since the last diesel purge. Since this time between needed cleanings is shorter, I wonder if my injectors need replacing? Maybe mine are just worn too much or something. I found that I can get the injector nozzles really cheap, like $10 a piece or something. Would that fix my problem, or should I just do another diesel purge? I know diesel purge is a cheaper way to go, I just didn't know if new nozzles would make a robust change in power or not.

1991 300d, 256,000 miles