hey guys I'm new here and I have a 1990 F250 351w 5.8 EFI, I have problem up hills and at cruising speed. the trucks bucks and kicks like its stalling and the rpms jump way down for a quick second and come right back up. I've looked at forums and nobody seems to have an answer for this problem, any suggestions would be greatly appreciated, thanks
Normally I'd ask about the cats, but plugged cats normally don't jump back like that. Any codes? I'd also be looking for fuel pressure, might be worth while getting a gauge that you can read while driving. In the meantime, I'd check the fuel pressure regulator. When was the filter last changed?
No codes are being shown and I changed the filter like a week ago. I will need to see the fuel pressure I was told it was the spark cutting out but I can't find any problems there and I have a brand new MSD ignition system
Unless you are running your 351 in quarter mile drags or oval flat track you don't use racing plugs. They are a " cold " plug and don't get hot enough in street use to
burn off any fouling. Put in the proper plugs for starters. And don't use Autolite.