1999 E-150 5.4 replaced MAF, fuel filter, had CAT checked, EGR pressure sensor, IAC and several other things runs alot better but I noticed when I turn on the air conditioner it runs a lot worst. now what still thinking it must be the EGR valve itself
all the EGR does is work with the Idle,ruel that out.sounds like the fuel injectors may be dirty run a bottle of fuel injection cleaner in a full tank of gas,will clean them up.the gas we have today,with the ethonol in it is not worth a crap.
already ran a bottle of sea foam thru
how about coil packs
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