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Message: <blockquote data-quote="cobrajeff96" data-source="post: 1565058" data-attributes="member: 29141"><p>If you put a 4-cyl fuel pump, chances are it's of less flow rate than a v-8 pump. All fluids are more viscous when cold, and in a cold start the computer is dumping more fuel into the engine to begin with. When temps rise enough, the fuel temp will rise as well. I doubt it's rising enough to cause vapor lock, but the pump must be able to keep up with the demands of the entire fuel system. Also, just because an ignition component was changed doesn't always mean it went through QC testing - it could be a bad wire/plug/coil/etc. FWIW, always buy OEM equipment when it comes to ignition unless you got deep pockets and can get Holley or the like.</p></blockquote><p></p>