My 97 Grand Cherokee cranks but no start . It had been running night before I went out to start it up it would crank but no start , i had a 1/4 tank of gas but low fuel light was on put gas in it tried spray starting fluid in it , no start . So i put more gas in about 5 gal low fuel still on. I start checking ignition parts replaced cap and button checked plug ,no fire ,checked coil tested good , replaced pickup coil, I had replaced the crankshaft sensor about 4 yrs ago . test it if i check it right good. One problem with it when temp drop below 50` it would not stay running after about 5-6 times of cranking it and keeping my foot on gas till it warmed up it would stay running . What else do i need to check?