Question about 1994 Chevrolet S-10 Blazer

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Misses at low rpm and speed. runs great above 35 mph.

Changed the wires, plugs, cap & rotor and the cat ????

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Do an RPM drop test to see if you have a lazy/dead cylinder. Here's how:

Posted on Oct 02, 2009

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My little Ford Ka (Fiesta) was missing and vibrating badly at idle up until 2000 rpm. The spark plug cables were the problem. Also it's a good time to change the oil and the spark plugs too.

Posted on Oct 29, 2009

  • nvgreengo Oct 29, 2009

    I'm sorry I didn't read that closely. The next step would be to check the timing and adjust if necessary. After that you need to check the fuel pressure but that might call for a real mechanic. At least at that point you've eliminated the basic possible issues.

    Good Luck!



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Car reaches 60-65 MPH, then slows down to 35 or 40m/h....changed mission filter and oil, and speed sensor....tuned up

on the off chance check the condition of the cat converter as it may be blocking the exhaust and acting as an exhaust brake above certain speeds
run the fault codes as well to check for other sensor problems

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Van running like its missing

the problem is not in the plugs , wires , cap , rotor but in dirty injectors or injector controls and wires
use a quality injector cleaner for a few tanks of fuel
ECM controlled cars do not a tune up as the computer does that 60 times a minute so all you need to do is to run the fault codes and fix the faulty sensors
fault codes are being recorded all the time and only the serious engine or transmission faults put the engine light on

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