Car seems starve at higher rpm, like when shifting gears, so have to run engine at higher than normal rpm at shift points. Upgraded air intake, helps a lot, but still feel the missing at high rpm. Replaced all the coils, way too much, prefer a simple distributor/ coil, easier to fix, cheaper.

Replace spark plugs. Tried premium fuel, no change. Wonder if it’s the fuel pump???

Poor fuel economy, lucky to get more than 19 MPG. Old Maxima 1996, with 6 Cyl engine got much more when new.