This just started yesterday. My car will idle just fine then it will kinda hiccup and the rpms will drop real low for a second then back to normal idle. This occurs every two to three seconds. It also happens while driving. I hope my MSD box isn't going bad! What could this be?

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'85 Z28 - black with gold trim - TPI 305 (pre-peanut cam 215hp) - Accel Super Coil - Accel 8.8mm wires - Morroso trans cooler - MSD-6A - Flowmaster exhaust - high flow cat - K&N filters - smog delete - 3.23 rear

'94 Camaro SC - medium patriot red metallic - 3.4L - Dynomax muffler - Z28 wheels

Sir John; Order of Knights of the Mighty Cascade Crew

 

Whats your fuel pressure? your fuel pump may be about to kick off.........

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"84Z28/'91 305TPI comp cam flowmaster TB coolant bypass/shutoff valveto heater core MAT relocated Ram-Air(home-made) gutted air-box IROC ground effects/wheels GY245/50's 700R4 superior shift kit/ corvette servo(excellent shift kit BTW) Rebuilt engine and transplanted it myself.
LOW performance people should drive low performance vehicles!

 

Thanks for the reply, but I figured it out. Its the f*cking Mass Airflow Sensor! This is the second one in two years thats gone bad!

 

Can you convert to Speed Density? I don't know the answer but if you can, you may want to if your climate or car for some reasons makes MAF sensors malfunction prematurely.

 

I would love to change to speed density, unfortunately that would involve a computer and harness swap and I don't think I'm up for that.

Actually, I think I fixed the problem. I did the TB coolant bypass and ran the heater hose under the MAF sensor. It was right up against it and I think it was heating it up. I moved the hose down a little and the problem seems to have gone away. Keep your fingers crossed!