hi Mike........its a 2.3 engine...I am pretty sure its got something to do with electrial sensors for heat havent actually tested them yet but was checking for loose wires and such turned off heater inside and the problem stopped then when backing out of garage to go in for dinner blew a fuse for dash gauges grrrr... Replaced block used my intake and exhaust and put sensors from my old motor in have checked grounds and havent found anything loose