Help. 96 F150, 351 engine is extremely hard to start when humidity is high. Starts and quits then for no reason just fires up normal. Has been on computer and no problems seen. Acted like it was iceing up but wasn't the fact....any suggestions dave goetz

 

Weather related problems are almost always ignition (barring the fuel freezing) related. Check the usual igntion module/distributor/wires/plugs.