Joined: Mar 2006
Location: Peterborough, Ontario, Ca
Engine stumbles and shakes when I give it open throttle under load
My 5.0 LX has 285,000kms on it now but the engine has always been like a rock. Out of nowhere it just started having this weird problem where it stumbles and bumps and shakes when I step down on the gas all the way. It feels like an electrical problem or a sensor that's malfunctioning.
It seems to happen in any gear, especially when the rpm is low and I try to give it open throttle. When the rpm is at like 2,000 and I step down hard it really shakes and bumps around. If I just give it a little gas and accelerate like a grandma it doesn't show the problem at all. It's not fuel pump is it? It never stalls out.
Another important point is that the shaking etc. doesn't seem to happen if I'm in neutral and rev it up. It seems like it's only when it has to move the car that there's a problem.
I haven't had too much time to fiddle with it yet, but I did find a loose connection on the positive terminal at the battery. I thought that would have been it but tightening it didn't seem to fix it.
Any suggestions would be much appreciated. Thanks!!!