BUT, There were several list members who bought the +4 plugs, only to find
that their trucks ran horribly. This included lower power to the rear
wheels, and severe detonation (MIL Light in one case). They pulled the plugs
and installed their OLD plugs. Then the truck ran well again. One of the
guys called Bosch and was told by them that the +4 plug was not intended for
use in a high stress enviroment like a truck. BTW, they did take them back
and get their money back too.
John
98 Dak 4X4 CC Sport, 5.2L, Auto, Leach headers
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