On Monday, shares of storied electric car maker Tesla Inc. (TSLA Quick QuoteTSLA - Free Report) are tumbling, down around 4.5% in morning trading to $245.42 per share after Goldman Sachs (GS Quick QuoteGS - Free Report) downgraded the automaker’s stock. Analyst David Tamberrino turned negative, cutting TSLA to Sell from Neutral and slashing his six-month price target to $185 from $190.

"While we believe Tesla currently has a lead relative to OEM (original-equipment market) peers with respect to vehicle technology adoption, electric vehicle architecture, and (potentially) battery scale, our concerns are more near-term oriented with respect to operational execution on the Model 3 launch, an unproven solar business, and cash needs," Tamberrino said in a note to clients.

Goldman is already expecting Tesla’s launch of its low-cost, mass-market Model 3 to be delayed, despite reassurance from the company in its earnings report last week that the vehicle is on schedule to arrive in July. The firm also believes Tesla will be forced to issue $1.7 billion in shares in the upcoming third quarter to fund its capital-spending plans.

The electric car maker’s fourth quarter earnings were mixed, with strong revenues despite a significant net loss. It was a fairly normal report for Tesla, filled with inconsistencies and ambitious goals made by CEO Elon Musk. As more Wall Street firms turn bearish, investors would be wise to remain cautious on Tesla.

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