i put a 2002 grand cherokee 4.0 in my 89 and now its time to replace the plugs. the engine only had 25,000 miles on it so it still had factory plugs. my question is, should i get the plugs for the year of the engine or the year of the cherokee? I am using all the 89 electronics including the "distributor"
zedpapa
zedpapa