Engine Performance problem
1996 Lexus SC 400 V8 Two Wheel Drive
while driving one day lexus started missing, like slight backfire. Check engine lite came on. Next day after driving all day car after stopping at store, upon returning lexus would not start-or just not kick-in. Took to ase shop. Mechanic could not find any problem, drove for a week now didnot start after coming out of store. Seems like when weather is wet like car does not start? Has 139xxx and was not always using prem fuel.