99 Chevy S-10 Problem?

Question

My 99 S-10 just had a tune up: plugs, wires, fuel filter & new serpentine belt put on. New catalytic converter too. Lugging the engine down in high gears w/low rpm's-it hiccups. It doesn't smooth out until you get the rpm's up. It acts like its starving for fuel.

Why is it doing this and how can I fix this. One mechanic said the O2 sensors were bad another mech said they were fine. So I think I've ruled out O2 sensors.

Any other ideas?

It is a 4 cyl/5 spd. I just had the fuel injectors cleaned today. More peppy but still coughing.

Answer 1

Any reputable shop can tell if the sensors are working or not by use of a scanner, its not a guessing game they are going lean rich lean rich or they aren't working. Before you throw any more parts at it 'hoping' to fix the problem may I suggest taking it to a reputable repair facility and getting a no obligation diagnosis done for approx. cost of one hours labor, what that means is they can tell you what is causing this for around a hundred bucks and keep you from throwing all these new parts at it and accomplishing nothing good luck.

Answer 2

Sounds like your fuel pump. Check your fuel pressure, you may have a weak fuel pump. Pressure should be 32 pounds. What kind of spark plugs did they put in it?

Answer 3

it really matters if the correct plugs were put in...if the shop put the cheap ones in and not the ones with a suppressor....then you WILL have problems. they will work but it will run bad and maybe a engine code...check it out...they are high dollar plugs...

Answer 4

is it a four cylinder truck with a five speed trans?
if so it is normal. down shift.

Answer 5

gap your spark plugs... recheck if you had a "mechanic" do it..