Just looking for a starting off point and some more ideas here before getting started tracking this down. The 93 4 door 2.0 auto just started running rough and stumbling only when braking. It's intermittent and therefore hard to figure out what's going on. I drove it yesterday and it seems like when lightly braking it will start to run rough, but I could only get it to do it for maybe 2 seconds tops. It won't do it under hard braking at all. I also think it varies: my wife said it was worse the day before and continued running rough once while sitting at a light. It runs fine and feels normal otherwise.
I looked around for any signs of bad hoses and didn't see any, but that's about as far as I've gotten. It also has pretty new plugs and wires, but I will double check there also and may try a spare set just to rule it out. I had an intermittent issue a few years ago I was having trouble tracking and it was a bad wire. My only other idea is maybe something with the booster.
Anyway, like I said, just looking for some more ideas or better yet if someone has had this exact problem! Thanks!
• 86 Skyhawk wagon : 2.0SOHC swap, Megasquirt, 20SEH cam
• 93 Sunbird sedan : 2.0SOHC, Microsquirt, ported head, 10:1
• 88 Sunbird coupe : 2.0SOHC, turbo project car, giant tires
Things to check:
PCV valve
PVC hose
Brake booster
Brake Booster Hose
TCC Brake pedal switch
Trans Fliud Level.
Doug in PR
92 Pontiac Sunbird LE, 2.0, AT, Red / Black with Grey 155K miles. Hurricane Maria Survivor ! ( It takes a licking and keeps on ticking ! ).....in Salinas, Puerto Rico!
Thanks Doug!
Think it may have been the booster hose, although the old one looks fine.
Some more driving will tell I'm sure.
• 86 Skyhawk wagon : 2.0SOHC swap, Megasquirt, 20SEH cam
• 93 Sunbird sedan : 2.0SOHC, Microsquirt, ported head, 10:1
• 88 Sunbird coupe : 2.0SOHC, turbo project car, giant tires
