Cruiser was running rough so I pulled the codes,it indIcated TPS.I wondered why on a cruiser that had not been hit,taken apart,or messed with would need this done. So I pulled the spark plugs and found three very nice,one fouled out,one with half the porcelain cracked off,and the last one fairly black.I put new Toyota plugs in cruiser runs great no more TPS code.Motto go with your gut. Mike p.s. Replaced fuel line which was cracked bad but not leaking yet!