AO Platinum Member
Join Date: Feb 2002
Location: The land that Time forgot
I'd guess it's sensor related, since the beast idles and accelerates under load okay.
A shonky MAF sensor could cause hiccups.. and you could have interference from a stroppy Idle Control Valve if it's getting confused at light loading.
For the first one, take the MAF out and make sure it's all clean. There's a little wire that hangs out there in the intake air stream.. If it's caked in oily goo (panel or cone filter?) then give is a squirt of carb' cleaner.. to remove the contaminants. Be veeeeeery gingerly with it when you clean it.
The ICV can get moody if it's covered in crud too. It tells the engine when to shut off fuel flow when you're coasting with no throttle... all based on the vaccum in the inlet. The beast sits on top of the throttle body. If the MAF clean up doesn't work, take the ICV off and clean up the little rotary valve inside. It should be metal coloured, not black.
While you're there.. use the poking around to check for air leaks, and to make sure the rubber inlet trumpet (with the "bellows" section) just before the throttle body isn't split.
The throttle cable should not be under tension when the throttle is off, so check that it's not holding slightly open (to mask some other symptom?). You can adjust it by moving the position of the little G-washer on the cable end.
No bullets for Chaingun..