nicky

Ive been running a k&n cold air intake, shorty headers, no cats with x-pipe with a edge evolution programmer tuned by power hungry i recently had the throttle body ported and polished instead of buying a new larger one but since thats been done it has started lagging more than usual off the bottom. could larger injectors solve this? im thinking going from the stock 19 to 21 or maybe 23 pound

97f150ny

I would double check all connections first of all. Second I would check for a vacuum leak. Third I would check MAF. Fourth I would check the TPS. How does it idle. Any codes? When was the last time the plugs were changed?