89 suburban stalled out, will start for about 3 seconds then quits

Check crankshaft sensor.

fuel filter inline some were

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starter for sure.

Try taking the exhaust pipe loose at the manifold. I had a Chevy Suburban that acted the same way, it turned out to plugged catyletic converter. The converter wasn't letting the exhaust out, the truck had no power, it would stall and then start right up and great for about five seconds the run rough and quit. Once I disconnected the exhaust it started right up and ran great. You could also try taking the O2 sensors out (for test purposes) ahead of the converter that will give the exhaust a place to go

a bad crank sensor can cause this. shuts off while going down road, and will start about 10 min, later with no problems runs fine until it quits again. hope this helps,

You need to replace the fuel filter every 30000 miles.The gas stations tanks are full of dirt. Also check the flow of the catalitic converter.Put your hand at the tail pipe while someone is pushing the gas petal down. The farther they push the petal the more exhaust should be coming out.
I hope this helps you

Check fuel flter at fuel pick-up intank (looks like a small wire sock). Remove fuel filter and fitting at fuel rail. Blow out fuel lines w/about 35lbs air press. Ck electrical @ relay - should be 4 connectors - one is key on hot/one is always hot/one is ground and last is hot to fuel pump. Good Luck

it sounds like one of your sensors went out do you have any type of a obd2 tester ? off the top of my head i'm thinking it could be a cam shaft sensor but not sure till you run a diagnostics on it

lisalavin,

You said,

My 1990 Buick century stalls out when in park after idling for a minute or two and stalls out when brake is applied. last night it did this every time I had to stop or make a slow turn it also started shaking a bit but if i released gas a little bit it would stop. i thought the shaking might be the cvu joint as it needs to be replaced but it started doing it on straight aways and hills also but would still stop shaking if gas was eased up on. Closer to home when it was stalling the only way I could get it to stay running while I put it in drive was to have one foot on the brake and the other on the gas. Is this a matter of changing the fuel filter or is it something more complicated?

It can be one of many things causing this!
1. Low idle, needs to be raised
2. A vacuum leak, needs to be diagnosed.
3 The choke, if it's when it's cold or the engine is cold and not up to running temp.

4.But, I'll l bet it's a idle sensor

Or last and probably NOT a broken baffle in the cat converter!
this usually happens more often not just with the stop but even when driving!

Bless you,
huuum
You really need a good honest HANDS on diagnoses!

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