Navi idles fine but when given gas its stalls
Hello all..I have a 98 Navigator that I had to put an insert in on the #3 plug position(blew). So I decided to change the plugs since it was due for a tune-up. When I was done and started it up, it idles fine. But when I drive, its misfiring and bucking(especially when it shifts to 3rd gear). Engine code pointed to #4 coil so I replaced it again, then #1 coil went so I bought 4 new coils for the infamous left side of the Triton. Replaced the MAF and cleaned the IAC with cleaner. Still idles fine but drives bad. Any further suggestions anyone? Btw this site is the reason I've tried all that I have so far. Thanks.