My 97 Ranger sometimes will not start. I can spray starter fuild and it will start. It's almost like I have a blocked line sometimes. I thought it might have been the gas. So I ran it till the gas light came on. Went to another station and bought high grade gas. I haven't bought any more gas from that 1st station. For a 12 days it ran just fine, till yesterday. Same problem again. Today it took almost 10 min. to get it to stay running.