My 97 Toyota Tercel keeps burning out spark plugs?

Question

First noticed last year after long drive of 300 miles straight. Burnt out one spark plug and car bucked like a pony running on 3.
Had one coil replaced and changed the spark plugs. Fixed.
Now 1 year later, I burn out a plug every month or so after a long drive, or one uphill. I feel like it has something to do with the amount of fuel the plugs are getting. It is stick shift and when the timing between the brake and the clutch is difficult, like going up a steap incline in snow or driving in real racing traffic in NYC then the spark plug burns out (ends burn then break off) under the coil packs only.
***This car has on the engine a sticker requesting only double grounded spark plugs (two arms at end) which I noticed a few months back. The double plug gives the car a lot more power but is burning out quite quickly. Car has 96K. Problems started at 70K. Should I try the new Bosch 4 grounded plug? If it is a fuel problem, how does one adjust the amount of fuel going to the plugs? Thank

Answer 1

Hi Ya!
You might be shifting to early. By doing to you are lug-ing the motor. This will cause to spark plugs to foul, and building excessive carbon on the upper part of the cylinder walls, as well as other maintenance issues. Shifting early is a good way to keep you fuel consumption down, but this is just a couple of the problems that usually comes with it.
So if you have a tach... Take the motor up to about 3-4 thousand rpm's before shifting.
If you don't have tach, go about 5 to ten miles faster before each shift.
Do this after changing the plugs.
Hope my opinion helped.

Answer 2

the head needs to be reworked!