van drove great. noticed oil in coolant so recently replaced blown head gasket. got everything back together and starts up fine. now no throttle response. can manuelly trigger to rev enhine but no response to gas pedal. guy who put engine back together states its most likely computer and just need to get new computer. is there anything else I should rry before this step? if computer was bad would it still start up and everythibg else working just fine. was driving with no problems before the head gasket replacement.