'91 stumble off idle
Thread Starter
Instructor
Joined: Sep 2007
Posts: 127
Likes: 13
From: Apollo Beach. Fla
'91 stumble off idle
it's a 383, otherwise stock. TPS 0.575v, 8 degrees initial, 40 psi w/ vacuum connected, no egr. When at operating temperature taking off from a light, I get a momentary stumble. When cold, there are no issues. Any ideas?
Thread Starter
Instructor
Joined: Sep 2007
Posts: 127
Likes: 13
From: Apollo Beach. Fla
plugs, cap, rotor, new
tps operates smoothly full range, 0.574v at idle
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
He already stated those in the OP. I would also check the fuel filter as you may get 40 psi at idle but when getting on the gas it might restrict the flow if its getting clogged up. PCV in good shape? And if none of that works you could check the condition of the MAF as it would make the car stumble when it starts going bad. If the stumble gets worse and worse thats probably it.
Thread Starter
Instructor
Joined: Sep 2007
Posts: 127
Likes: 13
From: Apollo Beach. Fla
Thanks all, I think I may have a too lean down low issue with the prom. The shop that made my wiring harness and burned the prom, offered to re-calibrate it if I could find no other possibilities. The fuel system, and all else seems ok, as it pulls strong all through the gears.
Team Owner
Joined: Feb 2006
Posts: 24,460
Likes: 7
From: sw Ohio
Thanks all, I think I may have a too lean down low issue with the prom. The shop that made my wiring harness and burned the prom, offered to re-calibrate it if I could find no other possibilities. The fuel system, and all else seems ok, as it pulls strong all through the gears.
