New Spark Plug solves the problem of lack of power on uphill driving???

89 fuel-injection Civil has a hard time climbing uphilll. I had this
problem for past
4 yr. Coud not find what the problems are. I was going to replace all
the sensor like MAP, altitude sensor. Well I replaced all spark plug
before I changed any sensor. To my surprise, new spark plugs seem give
me more firepower on uphill driving. My car is not struggling
anymore on uphill climbing. Still I'm not 100% sure if the spark
splugs solved the problem.
Were old spark splug bad enough to cause lack of firepower which led to
stalling and
struggling on uphill driving?

 

wrote in

What did the old ones look like?

 

funny, how old were the old ones ? hopefully not '89 plugs

 

Look not 100% perfect. Two of them are soaked with oil. All 4 plug
tip are black
and so looked burnt out. So possiblely 2 soaked spark plug caused
stalling and lack of power.

 

which end? the tip? or the white ceramic part?

All 4 plug

running rich.

 

The metal tip were soaked with hugh oil. I did not check that for
2 yr.
I guess I solved the problem of lack of power on uphill driving.
I definitely feel I got more power out of it.