vp calais heating up

[brooke2012]

hi i have a question i have a vp calais duel fuel lately was backfiring so i changed plugs leads and coilpack and switched it over 2 petrol it ran ok 4 a day but now it's stalling not backfiring anymore. i noticed that the thermo fan is not kicking in and car is heating up about quarter to half temp then stalling and wont start for 5 - 10 minutes, switched relays over and still didnt do much could it be the crank angle sensor??? timing??? or wat can someone help plz.....

[mr calais 5.0]

Is it a v6 or v8? V6's are common to back fire through the air box on duel fuel.. Have you checked for a code?

[brooke2012]

yes it's a v6 and thats what it'sdoing backfiring through the airbox yes checked 4 a code nothing coming up