I have a 1991 amigo with the 2.6 liter, and at around 130,000 miles, I noticed the "sluggish" acceleration when giving it 3/4 or more throttle. I did a complete tuneup on it, including, but not limited to the following:
cap and rotor (OEM from Isuzu)
plug wires (OEM from Isuzu)
Nippendenzo spark plugs (OEM - don't buy into the hype of splitfire or platinum plugs)
butterfly cleanup with carb spray
K&N air filter
I replaced ALL vaccum hoses and other hoses I could get my hands on, which made a big difference because they all had cracks in them or didn't fit good onto whatever they were supposed to be fitting onto.
The cap and rotor seemed to make the biggest difference in getting my power back. I also removed the A/C belt since it went out a while back. I plan on replacing the compressor and get it back and running though.
Friday, January 23rd, 2009 AT 11:22 PM