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LegitStreetCars finds cracked spark plugs in its "holy grail" Typhoon

Alex Palmeri's green GMC arrives shaking, and the repair takes more than fresh plugs, including undoing one new part.

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LegitStreetCars Story of October 30, 2026Trari Newsroom

Why this story? 901,790 views so far, and here is what is inside it.

I Bought A SUPER Rare GMC Typhoon That Sat For Years & Ran Horribly! DIY Fixed It All For Cheap!

Things we can learn from the video

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13:16Fuel pressure and regulator checks produce normal results, narrowing the misfire diagnosis.
17:42Two spark plugs have cracked porcelain insulators, providing a concrete ignition fault.
20:14Compression tests show strong results across the cylinders; new spark plugs improve but don't eliminate the stumble.
29:37Sandblasting exposes rust holes in the intercooler feed tube, adding coolant plumbing to the repair list.
30:22Alex bench-tests the injectors, replaces their seals and O-rings, and cleans the intake manifold.
56:47Reinstalling the original knock sensor clears the warning caused by a replacement with the wrong electrical resistance.

"It's here, my holy grail GMC Typhoon!" Alex Palmeri says as his Forest Green Metallic purchase arrives on a trailer. Then he starts the engine. The shaking makes clear that getting the truck home and getting it healthy are different jobs.

The LegitStreetCars restoration follows a methodical diagnosis rather than a single miraculous fix. After years sitting idle, the Typhoon has a misfire to investigate, but its unusually rust-free underside gives Alex something encouraging to work with.

Fuel pressure checks out. Accessing the spark plugs through the wheel well reveals two cracked porcelain insulators, while compression tests return strong results across the cylinders. Fresh plugs improve the running, but Alex puts the improvement at only about halfway there. That distinction matters: the first obvious fault isn't the whole job.

Off come the intake components and fuel rail. He bench-tests the injectors, replaces seals, cleans parts and tackles deteriorated coolant plumbing. Sandblasting even exposes holes in an intercooler feed tube. The video also includes a sponsored cleaner demonstration, separate from the mechanical diagnosis.

One replacement creates its own problem. A new knock sensor triggers a Check Engine light because its electrical resistance is wrong for the application. Reinstalling the original clears the warning, a useful example of why a new part isn't automatically the right part.

The lengthy workshop visit has drawn about 900,000 views in six days. In the comments, viewers discuss keeping this green Typhoon stock and using Alex's black salvage example for modifications. For them, getting it running properly and preserving what makes it special belong to the same project.

Published on Trari

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What viewers say

Find someone who looks at you the way Alex looks at a forest green metallic GMC Typhoon.
@screamer_chaotixSee it on YouTube
Yep definitely keep that "new" Typhoon as a stock example. Like the idea of using the black salvage Typhoon to modify and have fun with
@jimchambers6061See it on YouTube
Saturday Morning, LSC, Cup of Coffee, all is right with the world
@jtor1409See it on YouTube

5 more comments

I'd love to see Alex make a video that's a compilation of all the general maintenance he does on his fleet/collection. It would give a real world perspective of how much work it takes to keep them all on the road. Because if I could, there's around 40 cars and trucks I've always wanted to own. And I'm sure I'm not the only one.
@clstjam4321See it on YouTube
That color always reminds me of the old Ford Explorer Eddie Bauer edition!
@wittyncleverSee it on YouTube
Bro needs to get an oven so that he can start powder coating his own parts
@danielharder6912See it on YouTube
Do a Dry Ice blast on the underbody. that thing will come out minty
@dkmorris713See it on YouTube
Saturday CARTUNES are on!!!
@eman2289See it on YouTube