My water pump broke in my car about 2 months ago i took it to the shop and they replaced it and put a new timing belt on it.Now i get it back and the rpms sit at about 1500 then drop to 1000 then the engine light comes on and the car bogs.Like it trys to stay running then i hit the gas and it dosent do anything just makes it bog more but if i hold the gas and turn the key on and off real fast the engine light comes off and it runs good let go of the gas same thing happens agian.What could this be ?my ecu is 4 and 15 i know 4 is crank angle sensor but how do i fix that? is this the problem? and 15 is injectors how do i fix that? please help me out this **** is pissing me off by the way if i set my idle higher it works but its idling way to high like a 2000 its killing my gas money.