I am completly stuck here. For the past few months I've had problem with warm start but she would always crank over until recently. I first replaced crankshaft position sensor. Still same problem so I did a tune up (wires cap plugs). She ran perfect for two days after several perfect starts thought I found my problem. Then all sudden no start at all after running all day. Went back next day started perfect cold start. Coil tested bad so I rplaced. Still warm start issues I've had from the beggining and the check engine code 51 came up ( lean gas mix). She still starts fine cold until she warms up? I also changed fuel filter. Please any help I'm completly stuck here! It will start when warm most of the time if I give it alot of gas. One I unplugged the o2 sensor n it helped it start but didn't want to leave unplug n have it running too rich. Again anybody who has experienced these problems or maybe to give me some better idea. Haven't checked fuel pressure but I can smell gas flooding when it won't start